Beavers are the great architects of American ponds and streams. The North American beaver competes with the Eurasian beaver to be the 2nd largest rodent in the world, after another semi-aquatic mammal, the South American Capybara. The average weight of a beaver in New York State is 42 lbs, though 60 pounders are not that unusual. Beavers have an average body length of 2 and ½ feet to 3 feet, and a flat swimming rudder tail of 8 to 14 inches. The tail doubles as a warning device, used to loudly slap the water when predators, dogs or people are sighted.
Beavers can stay under water for about 15 minutes, with their ears and nostrils sealed, and can live to be twenty years plus. » Continue Reading.