CASTOROIDES GIANT BEAVERS(GIANT BEAVER (CASTOROIDES OHIOENSIS) SKELETON ON DISPLAY AT THE FIELD MUSEUM OF NATURAL HISTORY IN CHICAGO, ILLINOIS. TAKEN AUGUST 2006 BY C. HORWITZ, )
TABLE OF CONTENTSIntroductionClassiﬁcationDescription of BeaversFossilsClosingResources
INTRODUCTIONCastoroides, pronounced CASS-tore-OY-deezor giant beavers, appeared at the start of theLate Pliocene-Modern (3 million-10,000 years ago) period and the Late Pleistocene period. (Greek for "of the beaver family"); Graph found at Subcommission on Quaternary Stratigraphy
CLASSIFICATIONSOnly two known species:Castoroides leiseyorum- Located in FloridaKnown for shorter back legs, 6 inch incisors & narrow tailCastoroides Ohioensis- Located in Canada and UnitedStatesKnown difference is molar teeth and premolor from theCastoroides leiseyorum.
Skeletal and fossil evidence clearly display large teeth for chewing wood and powerful claws for digging. Their diet consisted mostly of plants. 2 3 1Prehistoric Planet Store, Picture 1,2,&3 (2012)
Some of the fossil remains of beavers from this period resemble the living beaver of today. Todays beaver is clearly smaller than the Castorodes beaver. This Ice age giant was known to reach over 8 feet in length, and weigh between 130-220 pounds, making him the largest known beaver, compariable to todays black bear. 07 January 2009 by Henry Nicholls Magazine issue 2690. Compared to each other t Pro life Managemen Photo from Wild Todays beaver 07 January 2009 by Henry Nicholls Magazine issue 2690.Photo from Kansas Dept of W, Parks and Tourismildlife
FIRST FOSSIL REMAINS WERE FOUND IN 1837, LOCATED IN OHIO.MIDWESTERN UNITED STATES TENDS TO BE THE CONCENTRATED LOCATIONFOR FOSSIL REMAINS, BUT RECORDED FOSSILS ARE FOUND AS FAR AS FLORIDA TO CANADA Map from google map .com
EXTINCTION POSSIBILITIESMans hunting of the beaver, but there is no solidevidence to show proof.Ecological reconﬁguring during the Pleistoceneperiod.Castoroides perished 10,000 years ago.Fossil dates show Castoides to be 1.4 million yearsold to 130,000 years old.
MYTHSNative Pocumtuck tribe had a giant spirit namedHobomock who killed the beaver was cursed to sleepfor perpetually as a mountain side of the earth.Native Mi’kmaq also had a very similar myth.Cree people were also among the myth believers.
THE AMERICAN BEAVER IS STILL COMMON IN THE LAKE TAHOE AREA TODAY.THIS THREE FOOT, PADDLE TAILED RODENT EATS BARK AND SMALL BRANCHESAND STOCKPILE SUPPLIES FOR THE WINTER. AFTER MILLIONS OF YEARS IT STILL LIVES IN BURROWS OR LODGES BUILT FROM FELLED TREES. Matt Renda Sierra Sun Photo from 2012 - Cooksey-Talbott Gallery Every trail guide.com
RESOURCESCanadian Museum of Nature, Notebooks: Giant BeaverKurtén, B. and E. Anderson (1980). Pleistocene Mammals of North America. Columbia University Press. pp. 236–237. ISBN 0-231-03733-3."Giant Beaver: Natural History Notebooks". Canadian Museum of Nature. 2011-05-02. Retrieved December 2011.Paleobiology Database, Collection 20403 and 20400. Location Leiseys Shell Pits 1A and 3B, Hillsborough County,Florida. Authorized and entered by Dr. John Alroy, on February 18, 1993 and Mark D. Uhen, Ph.D.Harrington, C.R. (1996). "Yukon Beringia Interpretive Center – Giant Beaver". Archived from the original on2007-09-14. Retrieved 2007-09-17.Reynolds, P.S. (2002). "How big is a giant? The importance of methods in estimating body size of extinctmammals". Journal of Mammalogy 83 (2): 321–332. DOI:10.1644/1545-1542(2002)083<0321:HBIAGT>2.0.CO;2.
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