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Kemp's ridley sea turtle (''Lepidochelys kempii)'', also called commonly the Atlantic ridley sea turtle, Kemp's ridley turtle, and Kemp's ridley, is a
species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
of turtle in the
family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
Cheloniidae. ''L. kempii'' is the rarest
species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
of
sea turtle Sea turtles (superfamily Chelonioidea), sometimes called marine turtles, are reptiles of the order Testudines and of the suborder Cryptodira. The seven existing species of sea turtles are the flatback, green, hawksbill, leatherback, loggerh ...
and is the world's most
endangered An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching, inv ...
species of sea turtle as well as the smallest. It is one of two living species in the
genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
'' Lepidochelys'' (the other one being ''L. olivacea'', the
olive ridley sea turtle The olive ridley sea turtle (''Lepidochelys olivacea''), also known commonly as the Pacific ridley sea turtle, is a species of turtle in the family Cheloniidae. The species is the second-smallest and most abundant of all sea turtles found in t ...
). The species ''L. kempii'' primarily occupies habitat around the Gulf of Mexico, though its migrations into the Atlantic Ocean are being affected by rising temperatures. Rising sea temperatures expand this species range, leaving them vulnerable to cold-shocking events when weather changes. Kemp's ridley sea turtle is listed as endangered under the
Endangered Species Act The Endangered Species Act of 1973 (ESA; 16 U.S.C. § 1531 et seq.) is the primary law in the United States for protecting and conserving imperiled species. Designed to protect critically imperiled species from extinction as a "consequence of e ...
(ESA), and conservation efforts are attempting to rebuild population numbers. Human activity, including
habitat destruction Habitat destruction (also termed habitat loss or habitat reduction) occurs when a natural habitat is no longer able to support its native species. The organisms once living there have either moved elsewhere, or are dead, leading to a decrease ...
, climate change, and oil spills, threaten populations.


Taxonomy

This species of turtle is called Kemp's ridley because Richard Moore Kemp (1825–1908) of
Key West Key West is an island in the Straits of Florida, at the southern end of the U.S. state of Florida. Together with all or parts of the separate islands of Dredgers Key, Fleming Key, Sunset Key, and the northern part of Stock Island, it con ...
was the first to send a
specimen Specimen may refer to: Science and technology * Sample (material), a limited quantity of something which is intended to be similar to and represent a larger amount * Biological specimen or biospecimen, an organic specimen held by a biorepository f ...
to Samuel Garman at
Harvard Harvard University is a private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of higher lear ...
, but the origin of the name "ridley" itself is unknown. Prior to the term being popularly used (for both species in the genus), ''L. kempii'' at least was known as the "bastard turtle". At least one source also refers to Kemp's ridley as a "heartbreak turtle". In her book ''The Great Ridley Rescue'', Pamela Philips claimed the name was coined by fishermen who witnessed the turtles dying after being "turned turtle" (on their backs). The fishermen said the turtles "died of a broken heart".


Description

Kemp's ridley is the smallest of all sea turtle species, reaching maturity at carapace length and weighing only . Conant R (1975). ''A Field Guide to Reptiles and Amphibians of Eastern and Central North America, Second Edition.'' Boston: Houghton Mifflin. xviii + 429 pp. + Plates 1–48. (hardcover), (paperback). (''Lepidochelys kempi'', pp. 75–76 + Plate 11). Typical of sea turtles, it has a dorsoventrally depressed body with specially adapted flipper-like front limbs and a
beak The beak, bill, or rostrum is an external anatomical structure found mostly in birds, but also in turtles, non-avian dinosaurs and a few mammals. A beak is used for pecking, grasping, and holding (in probing for food, eating, manipulating and ...
. Kemp's ridley turtle adults reach a maximum of in carapace length and weighing a maximum of . The adult's oval carapace is almost as wide as it is long and is usually olive-gray in color. The carapace has five pairs of costal scutes. In each bridge adjoining the plastron to the carapace are four inframarginal scutes, each of which is perforated by a pore. The head has two pairs of prefrontal scales. These turtles change color as they mature. As hatchlings, they are almost entirely a dark purple on both sides, but mature adults have a yellow-green or white
plastron The turtle shell is a shield for the ventral and dorsal parts of turtles (the Order (biology), order Testudines), completely enclosing all the turtle's vital organs and in some cases even the head. It is constructed of modified bony elements such ...
and a grey-green
carapace A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the unde ...
. Kemp's ridley has a triangular-shaped head with a somewhat hooked beak with large crushing surfaces. The skull is similar to that of the olive ridley. Unlike other sea turtles, the surface on the squamosal bone where the jaw opening muscles originate, faces to the side rather than to the back. They are the only sea turtles that nest during the day.


Distribution

The distribution of ''L. kempii'' is somewhat unusual compared to most reptiles, varying significantly among adults and juveniles, as well as males and females. Adults primarily live in the
Gulf of Mexico The Gulf of Mexico () is an oceanic basin and a marginal sea of the Atlantic Ocean, mostly surrounded by the North American continent. It is bounded on the northeast, north, and northwest by the Gulf Coast of the United States; on the southw ...
, where they forage in the relatively shallow waters of the
continental shelf A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water, known as a shelf sea. Much of these shelves were exposed by drops in sea level during glacial periods. The shelf surrounding an islan ...
(up to 409 m deep, but typically 50 m or less), with females ranging from the southern coast of the Florida Peninsula to the northern coast of the
Yucatán Peninsula The Yucatán Peninsula ( , ; ) is a large peninsula in southeast Mexico and adjacent portions of Belize and Guatemala. The peninsula extends towards the northeast, separating the Gulf of Mexico to the north and west of the peninsula from the C ...
, while males have a tendency to remain closer to the nesting beaches in the Western Gulf waters of
Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...
(USA),
Tamaulipas Tamaulipas, officially the Free and Sovereign State of Tamaulipas, is a state in Mexico; one of the 31 states which, along with Mexico City, comprise the 32 federal entities of Mexico. It is divided into 43 municipalities. It is located in nor ...
, and
Veracruz Veracruz, formally Veracruz de Ignacio de la Llave, officially the Free and Sovereign State of Veracruz de Ignacio de la Llave, is one of the 31 states which, along with Mexico City, comprise the 32 Political divisions of Mexico, Federal Entit ...
(Mexico). Adults of ''L. kempii'' are rarely found outside of the Gulf of Mexico and only 2-4% from the Atlantic are adults. Juveniles and subadults, in contrast, regularly migrate into the Atlantic Ocean and occupy the coastal waters of the continental shelf of North America from southern Florida to
Cape Cod Cape Cod is a peninsula extending into the Atlantic Ocean from the southeastern corner of Massachusetts, in the northeastern United States. Its historic, maritime character and ample beaches attract heavy tourism during the summer months. The ...
, Massachusetts, and occasionally northward. The time periods of these migrations appear to be growing longer due to rising sea temperatures. Accidental and
vagrant Vagrancy is the condition of wandering homelessness without regular employment or income. Vagrants usually live in poverty and support themselves by travelling while engaging in begging, scavenging, or petty theft. In Western countries, ...
records are known with some regularity from throughout the northern Atlantic Ocean and Mediterranean Sea, where the
Gulf Stream The Gulf Stream is a warm and swift Atlantic ocean current that originates in the Gulf of Mexico and flows through the Straits of Florida and up the eastern coastline of the United States, then veers east near 36°N latitude (North Carolin ...
is believed to play a significant role in their dispersal. Confirmed records from
Newfoundland Newfoundland and Labrador is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region of Labrador, having a total size of . As of 2025 the population ...
to
Venezuela Venezuela, officially the Bolivarian Republic of Venezuela, is a country on the northern coast of South America, consisting of a continental landmass and many Federal Dependencies of Venezuela, islands and islets in the Caribbean Sea. It com ...
in the west; to
Ireland Ireland (, ; ; Ulster Scots dialect, Ulster-Scots: ) is an island in the North Atlantic Ocean, in Northwestern Europe. Geopolitically, the island is divided between the Republic of Ireland (officially Names of the Irish state, named Irelan ...
, the
Netherlands , Terminology of the Low Countries, informally Holland, is a country in Northwestern Europe, with Caribbean Netherlands, overseas territories in the Caribbean. It is the largest of the four constituent countries of the Kingdom of the Nether ...
,
Malta Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...
in the Mediterranean, and numerous localities in between are known in the east, although more than 95% of these involve juveniles or subadults. Several reports from the African coast from
Morocco Morocco, officially the Kingdom of Morocco, is a country in the Maghreb region of North Africa. It has coastlines on the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria to Algeria–Morocc ...
to
Cameroon Cameroon, officially the Republic of Cameroon, is a country in Central Africa. It shares boundaries with Nigeria to the west and north, Chad to the northeast, the Central African Republic to the east, and Equatorial Guinea, Gabon, and the R ...
involve unverified specimens and may include misidentified ''L. olivacea''. In November 2021 a male was found alive on Talacre beach in
North Wales North Wales ( ) is a Regions of Wales, region of Wales, encompassing its northernmost areas. It borders mid Wales to the south, England to the east, and the Irish Sea to the north and west. The area is highly mountainous and rural, with Snowdon ...
. The turtle was taken to the Anglesey Sea Zoo for treatment, with the intent of eventual transportation back to the Gulf of Mexico.


Feeding and life history


Feeding

Kemp's ridley turtle feeds on
mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000  extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...
s,
crustacean Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthrop ...
s (such as floating
crab Crabs are decapod crustaceans of the infraorder Brachyura (meaning "short tailed" in Greek language, Greek), which typically have a very short projecting tail-like abdomen#Arthropoda, abdomen, usually hidden entirely under the Thorax (arthropo ...
s and
shrimp A shrimp (: shrimp (American English, US) or shrimps (British English, UK)) is a crustacean with an elongated body and a primarily Aquatic locomotion, swimming mode of locomotion – typically Decapods belonging to the Caridea or Dendrobranchi ...
),
jellyfish Jellyfish, also known as sea jellies or simply jellies, are the #Life cycle, medusa-phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animal ...
,
fish A fish (: fish or fishes) is an aquatic animal, aquatic, Anamniotes, anamniotic, gill-bearing vertebrate animal with swimming fish fin, fins and craniate, a hard skull, but lacking limb (anatomy), limbs with digit (anatomy), digits. Fish can ...
,
algae Algae ( , ; : alga ) is an informal term for any organisms of a large and diverse group of photosynthesis, photosynthetic organisms that are not plants, and includes species from multiple distinct clades. Such organisms range from unicellular ...
or
seaweed Seaweed, or macroalgae, refers to thousands of species of macroscopic, multicellular, marine algae. The term includes some types of ''Rhodophyta'' (red), '' Phaeophyta'' (brown) and ''Chlorophyta'' (green) macroalgae. Seaweed species such as ...
, and
sea urchin Sea urchins or urchins () are echinoderms in the class (biology), class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal zone to deep seas of . They typically have a globular body cove ...
s. Juveniles primarily are pelagic surface-feeders, while adults are opportunistic bottom-feeders that feed primarily on crabs. Research has shown that dives made by these turtles, including those made to forage, may be longer at night. Comparing dietary habits of head-started turtles (turtles raised in captivity before release) and wild turtles found little difference in variance in feeding habits, but variability exists in feeding habits due to habitat differences and maturation of the turtles. Variation in habitat region, as well as prey availability, were found to alter diet composition. Regional diet compositions aid in conservation efforts through enabling predicting food sources becoming affected by major events.


Life history

Most females return each year to a single beach—Rancho Nuevo in the Mexican
state State most commonly refers to: * State (polity), a centralized political organization that regulates law and society within a territory **Sovereign state, a sovereign polity in international law, commonly referred to as a country **Nation state, a ...
of
Tamaulipas Tamaulipas, officially the Free and Sovereign State of Tamaulipas, is a state in Mexico; one of the 31 states which, along with Mexico City, comprise the 32 federal entities of Mexico. It is divided into 43 municipalities. It is located in nor ...
—to lay eggs. The females arrive in large groups of hundreds or thousands in nesting aggregations called ''arribadas'', which is a Spanish word for "arrivals". Males will typically stay closer to breeding grounds. Juvenile turtles tend to live in floating
sargassum ''Sargassum'' is a genus of brown macroalgae ( seaweed) in the order Fucales of the Phaeophyceae class. Numerous species are distributed throughout the temperate and tropical oceans of the world, where they generally inhabit shallow water and ...
seaweed beds for their first years. Then, they range between northwest Atlantic waters and the Gulf of Mexico while growing into maturity. They reach sexual maturity at the age of 10–12. This is the only species that nests primarily during the day. The nesting season for these turtles is April to August. They nest mostly (95%) on a 16-mile beach in the Mexican state of Tamaulipas and on
Padre Island Padre Island is the largest of the Texas barrier islands and the world's longest barrier island. The island is located along Texas's southern coast of the Gulf of Mexico and is noted for its white sandy beaches. Meaning ''father'' in Spanish, ...
in the US state of Texas, and elsewhere on the Gulf Coast. They mate offshore. Gravid females land in groups on beaches in ''arribadas'' or mass nesting. They prefer areas with dunes, or secondarily,
swamps A swamp is a forested wetland.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p. Swamps are considered to be transition zones because both land and water play a role in ...
. The estimated number of nesting females in 1947 was 89,000, but shrank to an estimated 7,702 by 1985. Females nest one to four times during a season, keeping 10 to 20 days between nestings. Incubation takes 6–8 weeks. Around 100 eggs are in a
clutch A clutch is a mechanical device that allows an output shaft to be disconnected from a rotating input shaft. The clutch's input shaft is typically attached to a motor, while the clutch's output shaft is connected to the mechanism that does th ...
. The hatchlings' sex is decided by the temperature in the area during incubation. If the temperature is below 29.5 °C, the offspring will be mainly male. File:Turtle hatchling close-up, Texas (5984381381).jpg, Hatchling File:Lepidochelys kempii baby turtle.jpg, Hatchling File:Kemps Ridley Sea Turtle, Texas (5984946972).jpg, Juvenile turtle File:Kemp's Ridley sea turtle nesting.JPG, Adult turtle nesting File:Lepidochelys kempii, Kemp’s Ridley Sea Turtle, Tamaulipas.jpg, Nesting female returning to sea File:Kemp ridley sea turtle endangered species washes up on the beach.jpg, Deceased adult


Conservation

Kemp's ridley sea turtle is currently listed as endangered under the
Endangered Species Act The Endangered Species Act of 1973 (ESA; 16 U.S.C. § 1531 et seq.) is the primary law in the United States for protecting and conserving imperiled species. Designed to protect critically imperiled species from extinction as a "consequence of e ...
(ESA). Egg harvesting and poaching first depleted the numbers of Kemp's ridley sea turtles, but today, major threats include
habitat In ecology, habitat refers to the array of resources, biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species' habitat can be seen as the physical manifestation of its ...
loss,
pollution Pollution is the introduction of contaminants into the natural environment that cause harm. Pollution can take the form of any substance (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light). Pollutants, the component ...
, and entanglement in
shrimp A shrimp (: shrimp (American English, US) or shrimps (British English, UK)) is a crustacean with an elongated body and a primarily Aquatic locomotion, swimming mode of locomotion – typically Decapods belonging to the Caridea or Dendrobranchi ...
ing nets. Some major current conservation efforts are aimed towards habitat protection, reduction of bycatch, rescue and rehabilitation, and reduction of killing. Efforts to protect ''L. kempii'' began in 1966, when Mexico's Instituto Nacional de Investigaciones Biologico-Pesqueras (National Institute of Biological-Fisheries Research) sent biologists Hunberto Chávez, Martin Contreras, and Eduardo Hernondez to the coast of southern Tamaulipas, to survey and instigate conservation plans. And in the United States, Kemp's ridley turtle was first listed under the Endangered Species Conservation Act of 1970 on December 2, 1970, and subsequently under the
Endangered Species Act The Endangered Species Act of 1973 (ESA; 16 U.S.C. § 1531 et seq.) is the primary law in the United States for protecting and conserving imperiled species. Designed to protect critically imperiled species from extinction as a "consequence of e ...
of 1973. In 1977 an informal, binational multiagency, the Kemp's Ridley Working Group, first met to develop a recovery plan. A binational recovery plan was developed in 1984, and revised in 1992. A draft public review draft of the second revision was published by National Marine Fisheries Service in March 2010. This revision includes an updated threat assessment. From 1947 to 1985, ''L. kempii'' nests experienced a sharp decline from an estimated 121,517 nests in 1947 to 702 nests in 1985 (decline of 99.4%), and have since been exponentially recovering until approximately 2011–2016, where another decline in nests occurred. Nesting as of 2016 is estimated to be 9.9% of the nest estimate of 1947. One mechanism used to protect turtles from fishing nets is the turtle excluder device (TED). It is a grid of bars with an opening at the top or bottom, fitted into the neck of the shrimp trawl. It works by allowing small animals to slip through bars and get caught, while sea turtles strike the bars and are ejected through an escape hole on either the top or bottom of the device. These mechanisms designs are controlled through federal regulations to ensure proper use. There are multiple types of TED construction: oval grid, hooped, fixed angle, Super Shooter, Anthony Weedless, and flounder types. Each design is adapted to be best suited for certain conditions/uses or vary by complexity of the design. In September 2007,
Corpus Christi, Texas Corpus Christi ( ; ) is a Gulf Coast of the United States, coastal city in the South Texas region of the U.S. state of Texas and the county seat and largest city of Nueces County, Texas, Nueces County with portions extending into Aransas County, T ...
,
wildlife Wildlife refers to domestication, undomesticated animals and uncultivated plant species which can exist in their natural habitat, but has come to include all organisms that grow or live wilderness, wild in an area without being species, introdu ...
officials found a record of 128 Kemp's ridley sea turtle nests on Texas beaches, including 81 on North
Padre Island Padre Island is the largest of the Texas barrier islands and the world's longest barrier island. The island is located along Texas's southern coast of the Gulf of Mexico and is noted for its white sandy beaches. Meaning ''father'' in Spanish, ...
(
Padre Island National Seashore Padre Island National Seashore (PINS) is a national seashore administered by the National Park Service, located on Padre Island off the coast of South Texas, USA. In contrast to South Padre Island, Texas, South Padre Island, known for its beach ...
) and four on Mustang Island. The figure was exceeded in each of the following 7 years (see graph to 2013, provisional figures for 2014 as at July, 118.). Wildlife officials released 10,594 Kemp's ridley hatchlings along the Texas coast in 2007. The turtles are popular in Mexico as raw material for boots and as food. In July 2020, five rehabilitated turtles were released back in to Cape Cod with satellite tracking devices to monitor their wellbeing. A 2020 rescue mission to save 30 turtles from the freezing seas of Cape Cod was delayed by weather and technical issues, spurring a temporary rescue mission ''en route'' between Massachusetts and New Mexico. The Tennessee Aquarium offered overnight shelter and care, and the turtles were eventually released to the sea. These cold-stunning events may become more common with rising sea temperatures, as juveniles linger in near-shore waters in the American Northeast and are subjected to late-season storms.


Oil spills

Some Kemp's ridleys were airlifted from Mexico after the 1979 blowout of the Ixtoc 1 rig, which spilled millions of gallons of oil into the Gulf of Mexico. Since April 30, 2010, 10 days after the accident on the ''
Deepwater Horizon ''Deepwater Horizon'' was an ultra-deepwater, Dynamic positioning, dynamically positioned, Semi-submersible platform, semi-submersible offshore drilling Oil platform, rig owned by Transocean and operated by the BP company. On 20 April 2010, ...
'', 156 sea turtle deaths were recorded; most were Kemp's ridleys.
Louisiana Department of Wildlife and Fisheries The Louisiana Department of Wildlife and Fisheries (LDWF) is a state agency of Louisiana that maintains state wildlife and fishery areas. The agency is headquartered in the capital city of Baton Rouge. Mission The Louisiana Department of Wildlife ...
biologists and enforcement agents rescued Kemp's ridleys in Grand Isle. Most of the 456 oiled turtles that were rescued, cleaned, and released by the US Fish and Wildlife Service were Kemp's ridleys. Of the endangered marine species frequenting Gulf waters, only Kemp's ridley relies on the region as its sole breeding ground. As part of the effort to save the species from some of the effects of the ''Deepwater Horizon'' oil spill, scientists took nests and incubated them elsewhere; 67 eggs were collected from a nest along the Florida Panhandle on June 26, 2010, and brought to a temperature-controlled warehouse at NASA's
Kennedy Space Center The John F. Kennedy Space Center (KSC, originally known as the NASA Launch Operations Center), located on Merritt Island, Florida, is one of the NASA, National Aeronautics and Space Administration's (NASA) ten NASA facilities#List of field c ...
, where 56 hatched, and 22 were released on 11 July 2010. The overall plan was to collect eggs from about 700 sea turtle nests, incubate them, and release the young on beaches across Alabama and Florida over a period of months. Eventually, 278 nests were collected, including only a few Kemp's ridley nests. Since the 2010 Deepwater horizon spill, scientists have identified the δ13C values present in turtle scutes to reflect the incorporation of oil. Exposure to oil and the subsequent incorporation of δ13C isotopes has been linked to lessened reproductive success of Kemp's Ridley sea turtles.


References


Further reading

* Garman S. (1800). On certain Species of Chelonioidæ. ''Bull. Mus. Comp. Zool., Harvard College'' 6 (6): 123–126. (''Thalassochelys kempii'', new species, pp. 123–124). * Database entry includes a brief justification of why this species is critically endangered and the criteria used *


External links


Profile
from the OBIS-SEAMAP project of the Ocean Biogeographic Information System
Turtle Trax.org: Kemp's ridley sea turtle Profile


* ttps://web.archive.org/web/20061116101414/http://research.myfwc.com/features/category_main.asp?id=1289 Informationfrom the Florida Fish and Wildlife Conservation Commission
Texas Parks & Wildlife Dept. — Kemp's ridley sea turtle
{{DEFAULTSORT:Kemp's ridley sea turtle Lepidochelys Sea turtles Turtles of North America Reptiles of Mexico Reptiles of the United States Reptiles of the Caribbean Fauna of the Southeastern United States Biota of the Gulf of Mexico Critically endangered animals Critically endangered biota of Mexico Critically endangered fauna of the United States ESA endangered species Reptiles described in 1880 Articles containing video clips Habitats Directive species