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American Beaver Castor canadensis

Track Distinctive when not obliterated by wide drag mark of tail. Usually only 3 or 4 of the 5 toes print, leaving wide, splay-toed track 3" (75 mm) long. Webbed hindfeet leave fan-shaped track often more than 5" (125 mm) wide at widest part, at least twice as long as forefeet; webbing usually shows in soft mud.

Sign Alarm signal: Slaps tail on water loudly enough to be heard at a considerable distance.
Dams and lodges: Dams across streams of woven sticks, reeds, branches, and saplings, caulked with mud. Dome-like lodges in water, 6' (2 m) high or higher, up to 40' (12 m) wide.
Scent mounds: heaps of mud, sticks, and sedges or grass, up to 1' (.3 m) high and 3' (1 m) wide, where beaver deposits scent from anal glands, apparently to mark family territory.
Gnawing signs: Logs and twigs peeled where bark is eaten. Felled trees and gnawed tree trunks; gnawings at considerable heights made when beavers stand on surface of deep winter snow; successive gnawings, made when snow is at different levels, may produce totem-pole effect. Leaves pointed, tooth-marked stumps when cutting down saplings for bark or building material, and gnaws bark from aspens, willows, and birches.
Scat: Seldom deposited on land; distinctive oval pellets, 1" (25 mm) long or longer and almost as thick, of coarse, sawdust-like material that decomposes quickly; may contain undigested pieces of bark.