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.
Distribution. Species range provided by WWF's Wildfinder. The Red squirrel can be found in a number of locations including: Asia, China, Europe, Russia, United Kingdom, Wales. Find out more about these places and what else lives there.nstantly recognisable by their red fur, ear tufts and long, fluffy tails, red squirrels were once the only squirrel species in Europe. This changed when grey squirrels were introduced from America to the UK in the late 1800s.