Screaming Beavers

Beavers

Description The beaver is North America's largest rodent. Adults may be 4 feet long and weigh over 60 pounds. A beaver is easy to identify because of its large size, its distinctive webbed hind feet and its large flat tail that resembles the end of a canoe paddle. The tail is nearly hairless and is a dull-black color. The "splat" that the tail makes when slapped on the water is one of the most distinctive of nature's sounds. The beaver's body fur is dark brown on its back and sides, and a light brown on its chest and belly. Its front feet are short and have heavy claws, and possess good dexterity for feeding, grooming, digging and lodge construction. Its hind legs are large and have fully webbed feet which propel it through the water when it is swimming. Like the muskrat's, the beaver's fur is virtually waterproof, and provides the protection and buoyancy necessary for the animal's extended underwater activities. The beaver's eyes are small in proportion to its body size, allowing moderate vision both under and above water. It has well-developed senses of smell and hearing, and its nose and ears have valvular processes which close tightly under water. There is a similar valvular process in its mouth behind the incisor teeth, which allows the beaver to gnaw while underwater. The beaver also possesses a specialized digestive system to help it digest tree bark, and a special respiratory adaptation which gives it the capability to remain submerged for nearly 20 minutes. These specialized physiological and morphological adaptations serve both positive and negative functions; they have made the beaver well suited for a specific environment, but have also restricted it to very narrow habitat tolerances. The beaver has two chisel-like incisors in its upper and lower jaws that grow constantly and are very effective tree cutting tools. These teeth are both self-sharpening and ever-growing, which means the beaver must use them continually to maintain their proper length and sharpness.