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.
Population: 120,000 in Scotland, 3000 in Wales and 15,000 in England . Red Squirrel Behaviour. Territory: the favourite habitat of the red squirrel is a large, mature Scots pine wood but they will also live in deciduous woodlands. The squirrels live mostly high up in the trees and build nests, dreys, in the forks of branches.