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.
Where Do Squirrels Live. There are many different types of squirrels that live in many different locations and environments. From forests to prairies to deserts, squirrels are able to live in many different places. Within their individual environments, some species of squirrels live mainly in trees. Some live mostly on the ground, and still others create burrows underground. Squirrels, such as the grey squirrel, make nests in trees from twigs and leaves.