Mammals metabolize ammonia into a molecule called urea: As you can see, this molecule contains two atoms of nitrogen. Although it requires metabolic energy to build, it also is less toxic than ammonia, and it requires less water to flush from the system.Your urine's main nitrogenous waste product is urea.ammals metabolize ammonia into a molecule called urea: As you can see, this molecule contains two atoms of nitrogen. Although it requires metabolic energy to build, it also is less toxic than ammonia, and it requires less water to flush from the system.
Tree squirrels are squirrels that live in trees and ground squirrels, like chipmunks and prairie dogs, are squirrels that live in the ground. As a general rule, tree squirrels have longer life spans than ground squirrels.1.
Squirrels can be confusing because there are so many kinds. In South Dakota there are three groups of mammals that are commonly called squirrels: ground, flying, and tree squirrels. Ground squirrels live in burrows and hibernate . Flying squirrels live in trees, don't hibernate , and are nocturnal . Tree squirrels live in trees, don't hibernate, and are only active during the day. All of these squirrels belong to the scientific family, Sciuridae, which also includes marmots, chipmunks, and prairie dogs. There are three species of tree squirrels in South Dakota. Red squirrels are native to the pine forests of the higher elevations in the Black Hills and the deciduous woods of the northeast corner of the state.