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.
Habitat and range. Gray squirrels live in hardwood forests, wooded parks and residential areas. They are found throughout Minnesota but are most common in hardwoods in the central part of the state. They make their homes in tree cavities but also build leafy nests in summer and fall.he eastern gray squirrel and eastern fox squirrel are among the most sought-after small game animals in Minnesota. A squirrel pressed in hiding against a tree is a challenging target. Moreover, its speed on the ground and through the treetops has vexed many a squirrel hunter.