The beaver is a large, primarily nocturnal, semiaquatic rodent. Castor includes two extant species, the North American beaver and Eurasian beaver. Beavers are known for building dams, canals, and lodges.
Beaver-like rodents Facts:
Mass: 11 – 32 kg
Length: 74 – 90 cm
Gestation period: 128 days
Despite their superficial differences, beavers, pocket gophers, and kangaroo rats are classified together on the basis of anatomical details, such as skull structure and evidence from DNA. Beavers are large semi-aquatic rodents with webbed back feet and a flattened scaly tail and occur across the northern hemisphere. Pocket gophers kangaroo rats, and allies have fur-lined cheek pouches (“pockets”) and are confined to the Americas. Pocket gophers are short-legged for burrowing, but kangaroo rats are bipedal with a bounding gait.
By slapping their broad flat tails on the surface of the water, beavers warn others of potential danger.