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 are members of the order Rodentia and comprise 50 genera and 273 species that are spread worldwide. Tree squirrels live mostly in tree nests called dreys, which they build high in the forks of trees. Drays are approximately the size of a football and are made of twigs, leaves or pine needles or grass. Shredded grasses, fresh leaves, moss, and lichens are used to line the inside of the nest.