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Castoridae
See textSkull of a beaverThe family Castoridae
Castoridae
contains the two living species of beavers and their fossil relatives. This was once a highly diverse group of rodents, but is now restricted to a single genus, Castor.Contents1 Characteristics 2 Evolution 3 Taxonomy 4 ReferencesCharacteristics[edit] Main article: Beaver Castorids are medium-sized mammals, although large compared with most other rodents. They are semiaquatic, with sleek bodies and webbed hind feet, and are more agile in the water than on land. Their tails are flattened and scaly, adaptations that help them manoeuvre in the water. Castorids live in small family groups that each occupy a specific territory, based around a lodge and dam constructed from sticks and mud
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Precambrian
The Precambrian
Precambrian
(or Pre-Cambrian, sometimes abbreviated pЄ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic
Phanerozoic
Eon. The Precambrian
Precambrian
is so named because it preceded the Cambrian, the first period of the Phanerozoic
Phanerozoic
eon, which is named after Cambria, the Latinised name for Wales, where rocks from this age were first studied. The Precambrian
Precambrian
accounts for 88% of the Earth's geologic time. The Precambrian
Precambrian
(colored green in the timeline figure) is a supereon that is subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale
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Asia
Metropolitan areas of Asia List of cities in AsiaList Bangkok Beijing Busan Chittagong Delhi Dhaka Doha Dubai Guangzhou Hanoi Ho Chi Minh Hong Kong Istanbul Jakarta Karachi Kuala Lumpur Manila Mumbai Osaka Pyongyang Riyadh Shanghai Shenzhen Singapore Seoul Taipei[4] Tehran Tokyo Ulaanbaatar Asia
Asia
(/ˈeɪʒə, ˈeɪʃə/ ( listen)) is Earth's largest and most populous continent, located primarily in the Eastern and Northern Hemispheres. It shares the continental landmass of Eurasia with the continent of Europe
Europe
and the continental landmass of Afro- Eurasia
Eurasia
with both Europe
Europe
and Africa
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List Of Semiaquatic Tetrapods
This is a list of tetrapods that spend part of their life cycle or a significant fraction of their time in water, and/or obtain a significant fraction of their food from an aquatic habitat. Semiaquatic Tetrapoda are those that are primarily or at least partly terrestrial but that spend a large amount of time swimming or otherwise occupied in water, either as part of their life cycle or as part of their normal behavior (e.g., feeding). Some marine mammals, such as the marine otter, the polar bear and pinnipeds, are semiaquatic, while others, such as the sea otter, cetaceans and sirenians, are fully aquatic. The only fully aquatic nonmarine mammals are several manatees (the Amazonian manatee
Amazonian manatee
and some populations of African manatee) and certain small cetaceans (river dolphins, the tucuxi, and some populations of Irrawaddy dolphin
Irrawaddy dolphin
and finless porpoise)
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Dam
A dam is a barrier that stops or restricts the flow of water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions. The word dam can be traced back to Middle English,[1] and before that, from Middle Dutch, as seen in the names of many old cities.[2] The first known appearance of dam occurs in 1165. However, there is one village, Obdam, that is already mentioned in 1120
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Cambrian
The Cambrian
Cambrian
Period ( /ˈkæmbriən/ or /ˈkeɪmbriən/) was the first geological period of the Paleozoic
Paleozoic
Era, of the Phanerozoic
Phanerozoic
Eon.[6] The Cambrian
Cambrian
lasted 55.6 million years from the end of the preceding Ediacaran
Ediacaran
Period 541 million years ago (mya) to the beginning of the Ordovician
Ordovician
Period 485.4 mya.[7] Its subdivisions, and its base, are somewhat in flux
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Dentition
Dentition
Dentition
pertains to the development of teeth and their arrangement in the mouth. In particular, it is the characteristic arrangement, kind, and number of teeth in a given species at a given age.[1] That is, the number, type, and morpho-physiology (that is, the relationship between the shape and form of the tooth in question and its inferred function) of the teeth of an animal.[2] Animals whose teeth are all of the same type, such as most non-mammalian vertebrates, are said to have homodont dentition, whereas those whose teeth differ morphologically are said to have heterodont dentition. The dentition of animals with two successions of teeth (deciduous, permanent) is referred to as diphyodont, while the dentition of animals with only one set of teeth throughout life is monophyodont
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Eocene
The Eocene
Eocene
( /ˈiːəˌsiːn, ˈiːoʊ-/[2][3]) Epoch, lasting from 56 to 33.9 million years ago, is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic
Cenozoic
Era. The Eocene
Eocene
spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene
Oligocene
Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in comparison with the more common isotope 12C. The end is set at a major extinction event called the Grande Coupure (the "Great Break" in continuity) or the Eocene– Oligocene
Oligocene
extinction event, which may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay
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Oligocene
The Oligocene
Oligocene
( /ˈɒlɪɡoʊsiːn/) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present (7001339000000000000♠33.9±0.1 to 7014726771528000000♠23.03±0.05 Ma). As with other older geologic periods, the rock beds that define the epoch are well identified but the exact dates of the start and end of the epoch are slightly uncertain. The name Oligocene
Oligocene
comes from the Ancient Greek ὀλίγος (olígos, "few") and καινός (kainós, "new"),[2] and refers to the sparsity of extant forms of molluscs
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North America
North America
North America
is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere; it is also considered by some to be a northern subcontinent of the Americas.[3][4] It is bordered to the north by the Arctic
Arctic
Ocean, to the east by the Atlantic Ocean, to the west and south by the Pacific Ocean, and to the southeast by South America
South America
and the Caribbean
Caribbean
Sea. North America
North America
covers an area of about 24,709,000 square kilometers (9,540,000 square miles), about 16.5% of the earth's land area and about 4.8% of its total surface
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Miocene
The Miocene
Miocene
( /ˈmaɪəˌsiːn/[2][3]) is the first geological epoch of the Neogene
Neogene
Period and extends from about 23.03 to 5.333 million years ago (Ma). The Miocene
Miocene
was named by Charles Lyell; its name comes from the Greek words μείων (meiōn, “less”) and καινός (kainos, “new”)[4] and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene
Oligocene
and is followed by the Pliocene. As the earth went from the Oligocene
Oligocene
through the Miocene
Miocene
and into the Pliocene, the climate slowly cooled towards a series of ice ages
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Genus
A genus (/ˈdʒiːnəs/, pl. genera /ˈdʒɛnərə/) is a taxonomic rank used in the biological classification of living and fossil organisms in biology. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus.E.g. Felis catus
Felis catus
and Felis silvestris
Felis silvestris
are two species within the genus Felis. Felis
Felis
is a genus within the family Felidae.The composition of a genus is determined by a taxonomist. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera
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Nebraska
Welcome to NEBRASKAland where the West begins[5]Soil Holdrege seriesSong "Beautiful Nebraska"Other River: Platte RiverState route markerState quarterReleased in 2006Lists of United States
United States
state symbols Nebraska
Nebraska
/nɪˈbræskə/ ( listen) is a state that lies in both the Great Plains
Great Plains
and the Midwestern United States. It is bordered by South Dakota
South Dakota
to the north, Iowa
Iowa
to the east and Missouri
Missouri
to the southeast, both across the Missouri
Missouri
River, Kansas
Kansas
to the south, Colorado
Colorado
to the southwest and Wyoming
Wyoming
to the west. It is the only triply landlocked U.S. state. Nebraska's area is just over 77,220 square miles (200,000 km2) with almost 1.9 million people
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Corkscrew
A corkscrew is a tool for drawing corks from wine bottles, beer bottles and other household bottles before the invention of screw caps and Crown corks. In its traditional form, a corkscrew simply consists of a pointed metallic helix (often called the "worm") attached to a handle, which the user screws into the cork and pulls to extract it. Corkscrews are necessary because corks themselves, being small and smooth, are difficult to grip and remove, particularly when inserted fully into an inflexible glass bottle
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Pleistocene
The Pleistocene
Pleistocene
( /ˈplaɪstəˌsiːn, -toʊ-/,[2] often colloquially referred to as the Ice Age) is the geological epoch which lasted from about 2,588,000 to 11,700 years ago, spanning the world's most recent period of repeated glaciations
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American Black Bear
16, see textSynonymsEuarctos americanusThe American black bear
American black bear
(Ursus americanus) is a medium-sized bear native to North America. It is the continent's smallest and most widely distributed bear species. Black bears are omnivores, with their diets varying greatly depending on season and location. They typically live in largely forested areas, but do leave forests in search of food. Sometimes they become attracted to human communities because of the immediate availability of food. The American black bear
American black bear
is the world's most common bear species. It is listed by the International Union for Conservation of Nature (IUCN) as a least-concern species, due to its widespread distribution and a large population estimated to be twice that of all other bear species combined
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