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.
Eastern Gray Squirrels usually live in forests, but they are also seen in yards, gardens, and city parks. Basically, they live anywhere there are large, deciduous trees (trees whose leaves die in the Fall). These squirrels live in trees year-round, either in cavities or nests they build out of leaves.Cavities are often old woodpecker holes. Nests are usually high up in tree crotches. Nests are hard to see in the Summer, because they are made with green leaves, and are hidden by foliage (leaves on the trees).astern Gray Squirrels usually live in forests, but they are also seen in yards, gardens, and city parks. Basically, they live anywhere there are large, deciduous trees (trees whose leaves die in the Fall). These squirrels live in trees year-round, either in cavities or nests they build out of leaves.