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The beaver is the largest rodent in North America and competes with its Eurasian counterpart, the European beaver, for being the third-largest in the world, both following the South American capybara and lesser capybara. The European species is slightly larger on average but the American has a larger known maximum size.
Historically, the North American beaver was trapped and nearly extirpated because its fur was highly sought after. Protections have allowed the beaver population on the continent to rebound to an estimated 6–12 million by the late 20th century; still far lower than the originally estimated 60–400 million North American beavers before the ...
The taxonomic treatment [3] (designation and sequence of orders, families and species) and nomenclature (common and scientific names) used in the accompanying bird lists adheres to the conventions of the AOS's (2019) Check-list of North American Birds, the recognized scientific authority on the taxonomy and nomenclature of North America birds.
North American beavers (Castor canadensis) are the largest rodent species in the United States and the second largest in the world. They have stocky bodies, weigh between 35 and 65 pounds, and are ...
European (Homarus gammarus) and American lobsters (H. americanus) [206] [207] [208] date uncertain Europe, the United States: meat Captive-bred 6e Other arthropods: American bullfrog (Lithobates catesbeianus), northern leopard (L. pipiens), pig (L. grylio), and northern green frogs (L. clamitans melanota) date uncertain North America
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The North American porcupine has a long gestation period relative to other rodents, an average of 202 days. [38] By contrast, the North American beaver, which is comparable in size, has a gestation period of 128 days. [39] The eastern grey squirrel (Sciurus carolinensis) has a gestation period of just 44 days. [40]
North American beaver: Castor canadensis: Extant: 50 kg (110 lb) 5: Lesser capybara: Hydrochoerus isthmius: Extant: 45.4 kg (100 lb) 6: Eurasian beaver: Castor fiber: Extant: 40 kg (88 lb) 7: Cape porcupine: Hystrix africaeaustralis : Extant: 30 kg (66 lb) 8: Crested porcupine: Hystrix cristata : Extant: 27 kg (60 lb) 9: North American ...