Santa Ana National Wildlife Refuge is a National Wildlife Refuge situated along the banks of the Rio Grande, south of Alamo in the

Lower Rio Grande Valley The Lower Rio Grande Valley ( es, Valle del Río Grande), commonly known as the Rio Grande Valley or locally as the Valley or RGV, is a region spanning the border of Texas and Mexico located in a floodplain of the Rio Grande near its mouth. The ...

, in Hidalgo County, South Texas. The wildlife refuge was established for the protection of migratory

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweig ...

s in 1943. Its unique location is at the meeting of different climates and habitats: subtropical

wetland A wetland is a distinct ecosystem that is flooded or saturated by water, either permanently (for years or decades) or seasonally (for weeks or months). Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The p ...

Chihuahuan Desert The Chihuahuan Desert ( es, Desierto de Chihuahua, ) is a desert ecoregion designation covering parts of northern Mexico and the southwestern United States. It occupies much of far West Texas, the middle to lower Rio Grande Valley and the lo ...

Gulf Coast The Gulf Coast of the United States, also known as the Gulf South, is the coast, coastline along the Southern United States where they meet the Gulf of Mexico. The list of U.S. states and territories by coastline, coastal states that have a shor ...

, and Great Plains. Its

riparian A riparian zone or riparian area is the interface between land and a river or stream. Riparian is also the proper nomenclature for one of the terrestrial biomes of the Earth. Plant habitats and communities along the river margins and banks a ...

location has developed a reputation for diverse

birding Birdwatching, or birding, is the observing of birds, either as a recreational activity or as a form of citizen science. A birdwatcher may observe by using their naked eye, by using a visual enhancement device like binoculars or a telescope, ...

. Due to its location near the

Mexico–United States border The Mexico–United States border ( es, frontera Estados Unidos–México) is an international border separating Mexico and the United States, extending from the Pacific Ocean in the west to the Gulf of Mexico in the east. The border trave ...

, this wildlife refuge is threatened by the

Trump wall The Trump wall, commonly referred to as "The Wall", is an expansion of the Mexico–United States barrier that started in the U.S. during the 1980’s to keep help enforce immigration laws in the United States. Prior to Donald Trump, border ...

Fauna

Notable species among the fauna in the refuge include the Texas ocelot (''Leopardus pardalis albescens'') and Gulf Coast jaguarundi (''Puma yagouaroundi cacomitli'') feline species. Both species are listed as endangered in the ''

Endangered Species Act of 1973 The Endangered Species Act of 1973 (ESA or "The Act"; 16 U.S.C. § 1531 et seq.) is the primary law in the United States for protecting imperiled species. Designed to protect critically imperiled species from extinction as a "consequence of ec ...

, as Amended''. The Texas ocelot is listed in the

Convention on International Trade in Endangered Species of Wild Fauna and Flora CITES (shorter name for the Convention on International Trade in Endangered Species of Wild Fauna and Flora, also known as the Washington Convention) is a multilateral treaty to protect endangered plants and animals from the threats of intern ...

(CITES) Appendix I and the Gulf Coast jaguarundi ''(seen at left)'' is listed in the CITES Appendix II. While not considered endangered by the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of nat ...

(IUCN), these species are acknowledged as rare for the area.

Birds

Gallinula galeata and Anas discors Santa Ana NWR

397 bird species have been documented within the park's borders. Many of those are migratory species on their way to and from Central and South America. A few species to be found there are

black-bellied whistling-duck The black-bellied whistling duck (''Dendrocygna autumnalis''), formerly called the black-bellied tree duck, is a whistling duck that breeds from the southernmost United States, Mexico, and tropical Central to south-central South America. In the ...

fulvous whistling-duck The fulvous whistling duck or fulvous tree duck (''Dendrocygna bicolor'') is a species of whistling duck that breeds across the world's tropical regions in much of Mexico and South America, the West Indies, the southern United States, sub-Sahar ...

mottled duck The mottled duck (''Anas fulvigula'') or mottled mallard is a medium-sized species of dabbling duck. It is intermediate in appearance between the female mallard and the American black duck. It is closely related to those species, and is sometime ...

blue-winged teal The blue-winged teal (''Spatula discors'') is a species of bird in the duck, goose, and swan family Anatidae. One of the smaller members of the dabbling duck group, it occurs in North America, where it breeds from southern Alaska to Nova Scoti ...

green-winged teal The green-winged teal (''Anas carolinensis'') is a common and widespread duck that breeds in the northern areas of North America except on the Aleutian Islands. It was considered conspecific with the Eurasian teal (''A. crecca'') for some time, ...

cinnamon teal The cinnamon teal (''Spatula cyanoptera'') is a species of duck found in western North and South America. It is a small dabbling duck, with bright reddish plumage on the male and duller brown plumage on the female. It lives in marshes and ponds ...

least grebe The least grebe (''Tachybaptus dominicus''), an aquatic bird, is the smallest member of the grebe family. It occurs in the New World from the southwestern United States and Mexico to Argentina, and also on Trinidad and Tobago, the Bahamas and the ...

anhinga The anhinga (; ''Anhinga anhinga''), sometimes called snakebird, darter, American darter, or water turkey, is a water bird of the warmer parts of the Americas. The word ''anhinga'' comes from ''a'ñinga'' in the Brazilian Tupi language and means ...

tricolored heron The tricolored heron (''Egretta tricolor''), formerly known as the Louisiana heron, is a small species of heron native to coastal parts of the Americas; in the Atlantic region, it ranges from the northeastern United States, south along the coast ...

, white ibis,

lesser yellowlegs The lesser yellowlegs (''Tringa flavipes'') is a medium-sized shorebird. It breeds in the boreal forest region of North America. Taxonomy The lesser yellowlegs was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in ...

long-billed dowitcher The long-billed dowitcher (''Limnodromus scolopaceus'') is a medium-sized shorebird with a relatively long bill belonging to the sandpiper family, Scolopacidae. In breeding plumage, adults are characterized by a beautiful rufous head and underpar ...

, and

least tern The least tern (''Sternula antillarum'') is a species of tern that breeds in North America and locally in northern South America. It is closely related to, and was formerly often considered conspecific with, the little tern of the Old World. Ot ...

Osprey The osprey (''Pandion haliaetus''), , also called sea hawk, river hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range. It is a large raptor reaching more than in length and across the wings. It is brown o ...

broad-winged hawk The broad-winged hawk (''Buteo platypterus'') is a medium-sized hawk of the genus ''Buteo''. During the summer, some subspecies are distributed over eastern North America, as far west as British Columbia and Texas; they then migrate south to win ...

northern harrier The northern harrier (''Circus hudsonius''), or ring-tailed hawk, is a bird of prey. It breeds throughout the northern parts of the northern hemisphere in Canada and the northernmost USA. The northern harrier migrates to more southerly areas ...

, and peregrine falcon are among the migratory

birds of prey Birds of prey or predatory birds, also known as raptors, are hypercarnivorous bird species that actively hunt and feed on other vertebrates (mainly mammals, reptiles and other smaller birds). In addition to speed and strength, these predat ...

found in the refuge.

Hook-billed kite The hook-billed kite (''Chondrohierax uncinatus''), is a bird of prey in the family Accipitridae, which also includes many other diurnal raptors such as kites, eagles, and harriers. It occurs in the Americas, including the Rio Grande Valley of ...

and

gray hawk The gray hawk (''Buteo plagiatus'') or Mexican goshawk is a smallish Bird of prey, raptor found in open country and forest edges. It is sometimes placed in the genus ''Asturina'' as ''Asturina plagiata''. The species was split by the American Orn ...

, seen occasionally in the refuge, attract birders from around the world. More than 35 species of

New World warbler The New World warblers or wood-warblers are a group of small, often colorful, passerine birds that make up the family Parulidae and are restricted to the New World. They are not closely related to Old World warblers or Australian warblers. Mos ...

s have been seen, including the

golden-winged warbler The golden-winged warbler (''Vermivora chrysoptera'') is a New World warbler. It breeds in southeastern and south-central Canada and in the Appalachian Mountains in northeastern to north-central United States. The majority (~70%) of the global pop ...

magnolia warbler The magnolia warbler (''Setophaga magnolia'') is a member of the wood warbler family Parulidae. Etymology The genus name ''Setophaga'' is from Ancient Greek ''ses'', "moth", and ', "eating", and the specific ''magnolia'' refers to the type lo ...

Northern parula The northern parula (''Setophaga americana'') is a small New World warbler. It breeds in eastern North America from southern Canada to Florida. Description The northern parula is one of the smaller North American migratory warblers, often being ...

tropical parula The tropical parula (''Setophaga pitiayumi'') is a small New World warbler. It breeds from southernmost Texas and northwest Mexico (Sonora) south through Central America to northern Argentina, including Trinidad and Tobago. This widespread and co ...

American redstart The American redstart (''Setophaga ruticilla'') is a New World warbler. It is unrelated to the Old World (common) redstart. Taxonomy The American redstart was described by Carl Linnaeus in 1758 in the 10th edition of his ''Systema Naturae'' und ...

palm warbler The palm warbler (''Setophaga palmarum'') is a small songbird of the New World warbler family. Description Measurements: * Length: * Weight: * Wingspan: Taxonomy The species comprises two distinct subspecies that may merit specific stat ...

, and

yellow-breasted chat The yellow-breasted chat (''Icteria virens'') is a large songbird found in North America, and is the only member of the family Icteriidae. It was once a member of the New World warbler family, but in 2017, the American Ornithological Society mov ...

Butterflies

Spanish moss - Santa Ana National Wildlife Refuge

Santa Ana is home to almost half of all

butterfly Butterflies are insects in the macrolepidopteran clade Rhopalocera from the order Lepidoptera, which also includes moths. Adult butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. The group comprise ...

species found in the United States. More than 300 species of butterflies have been observed at the refuge, with as many as 65 having been seen on a single day.

References

External links

Fws.gov: Official Santa Ana National Wildlife Refuge websiteTexas Parks and Wildlife: Santa Ana NWR trails
{{authority control National Wildlife Refuges in Texas Protected areas of Hidalgo County, Texas Lower Rio Grande Valley Wetlands of Texas Protected areas established in 1943 National Natural Landmarks in Texas 1943 establishments in Texas