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.
Squirrel Facts & Squirrel Information. Two species of squirrel found on the West Coast are the native Douglas Squirrel (or Red Squirrel family) and the Eastern Grey Squirrel. The grey squirrel is the most common of the two species found locally in the Lower Mainland. The grey squirrel is originally from eastern North America and was introduced into Stanley Park in 1912. The grey squirrel population remained relatively contained until the late 1980's.