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Castoroidea
See text Skull of a beaver The family 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 . CONTENTS * 1 Characteristics * 2 Evolution * 3 Taxonomy * 4 References CHARACTERISTICS Main article: Beaver
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. They are herbivores, feeding on leaves and grasses in the summer, and woody plants such as willow in the winter
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Palaeocastor
See text PALAEOCASTOR ('prehistoric beaver') is an extinct genus of beavers that lived in the North American Badlands
Badlands
during the late Oligocene period. CONTENTS * 1 Habitat * 2 "Devil\'s corkscrews" * 3 References * 4 External links HABITAT Palaeocastor
Palaeocastor
fossor P. peninsulatus This creature made corkscrew-shaped burrows and tunnels. Like many early castorids , Palaeocastor
Palaeocastor
was predominantly a burrowing animal instead of an aquatic animal
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Miocene
The MIOCENE ( /ˈmaɪəˌsiːn/ ) 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 Sir Charles Lyell
Charles Lyell
. Its name comes from the Greek words μείων (meiōn, “less”) and καινός (kainos, “new”) and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene
Pliocene
. The Miocene
Miocene
follows the Oligocene Epoch and is followed by the Pliocene
Pliocene
Epoch. As the earth went from the Oligocene through the Miocene
Miocene
and into the Pliocene, the climate slowly cooled towards a series of ice ages
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Nebraska
Welcome to NEBRASKAland where the West begins SOIL Holdrege series SONG " Beautiful Nebraska " OTHER RIVER: Platte River STATE ROUTE MARKER STATE QUARTER Released in 2006 Lists of United States state symbols NEBRASKA /nᵻˈbræskə/ ( listen ) is a state that lies in both the Great Plains
Great Plains
and the Midwestern United States
Midwestern United States
. The state is bordered by South Dakota to the north, Iowa
Iowa
to the east and Missouri to the southeast, both across the 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
U.S. state
. Nebraska's area is just over 77,220 sq mi (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. More recent styles of corkscrew incorporate various systems of levers that further increase the amount of force that can be applied outwards upon the cork, making easier the extraction of difficult corks
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Pleistocene
The PLEISTOCENE ( /ˈplaɪstəˌsiːn, -toʊ-/ , 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 . The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic
Paleolithic
age used in archaeology . The Pleistocene
Pleistocene
is the first epoch of the Quaternary Period or sixth epoch of the Cenozoic Era . In the ICS timescale, the Pleistocene
Pleistocene
is divided into four stages or ages , the Gelasian , Calabrian , Ionian and Tarantian . All of these stages were defined in southern Europe . In addition to this international subdivision, various regional subdivisions are often used
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Steneofiber
STENEOFIBER is an extinct genus of beavers from Eurasia
Eurasia
. Steneofiber
Steneofiber
esseri This small, 30-cm-long (1-ft-long) creature probably lived in large freshwater lakes , like present day beavers. A semiaquatic lifestyle is indicated by the presence of combing-claws, which living beavers use to waterproof their fur. Most likely, it was incapable of bringing down trees like its modern relatives. Steneofiber
Steneofiber
was more terrestrial than modern beavers, living in burrows . The finding of a possible family group of Steneofiber
Steneofiber
skeletons in France
France
has been used to infer that the genus employed a K-selected reproductive strategy like modern beavers, in which extensive parental care is given to a small number of offspring
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Asia
Major Cities of Asia
Asia
List of cities in Asia List * Tokyo
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Agnotocastor
AGNOTOCASTOR is an extinct member of the beaver family Castoridae
Castoridae
. Unlike its modern relative, this species took the place of muskrats in the rivers of North America during the Oligocene
Oligocene
epoch. REFERENCES This article about a prehistoric rodent is a stub . You can help by expanding it
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Eocene
The EOCENE ( /ˈiːəˌsiːn, ˈiːoʊ-/ ) 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 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
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 ( /ˈɒlᵻɡoʊsiːn/ ) 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 (oligos, "few") and καινός (kainos, "new"), and refers to the sparsity of extant forms of molluscs . The Oligocene
Oligocene
is preceded by the Eocene Epoch and is followed by the Miocene
Miocene
Epoch. The Oligocene
Oligocene
is the third and final epoch of the Paleogene Period
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North America
NORTH AMERICA is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere . It can also be considered a northern subcontinent of the Americas . It is bordered to the north by the Arctic Ocean
Arctic Ocean
, to the east by the Atlantic Ocean , to the west and south by the Pacific Ocean
Pacific Ocean
, and to the southeast by South America
South America
and the Caribbean Sea
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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Trogontherium
TROGONTHERIUM is an extinct genus of giant beavers . Fossils of Trogontherium
Trogontherium
have been found in Middle Pleistocene formations of England, mainland Europe
Europe
, Yunnan, China , and Siberia, Russia . Jaws of Trogontherium
Trogontherium
boisvillettei SEE ALSO * Castoroides REFERENCES * ^ http://zipcodezoo.com/Animals/T/Trogontherium_cuvieri/ * ^ The Paleobiology Database Trogontherium
Trogontherium
entry accessed on 7 April 2010 This article about a prehistoric rodent is a stub . You can help by expanding it
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Castoroides
Castoroides
Castoroides
leiseyorum † Castoroides
Castoroides
ohioensis † Castoroides
Castoroides
dilophidus SYNONYMS * † Castoroides
Castoroides
nebrascensis Barbour , 1931 * †Burosor efforsorius Starrett, 1956 CASTOROIDES, or GIANT BEAVER, is an extinct genus of enormous beavers that lived in North America
North America
during the Pleistocene
Pleistocene
. C. LEISEYORUM and its northern sister species CASTOROIDES OHIOENSIS, were the largest beavers to ever exist. CONTENTS * 1 Description * 2 Classification * 3 Discovery and species * 4 Extinction * 5 See also * 6 References DESCRIPTION Restoration by Charles R. Knight Species
Species