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.
Red squirrels can be found on both coasts of North America and are widespread throughout Canada and Alaska. (McAdam, et al., 2007; Steele, 1998) Red squirrels live in a very large area in the northern half of North America. They can be found in the Rocky Mountains down to Arizona and New Mexico and east all the way up to Quebec, Canada. They live only in forest habitats, so in the southern parts of this area, there are not quite as many of them.