Monday, January 18, 2010

Orgin of black squirrels?

Squirrel color has natural variations in shade from light to black; check out a squirrel you can see all the colors. Black fur likely is a recessive trait. It would take two squirrels with the recessive gene to mate (each squirrel would have two fur color genes), then the offspring would to have both fur genes to be for black fur in order to actually have black fur. This characteristic usually may be naturally adventageous to have for survival in some areas. For example a dark forest they'd be less likely to be spotted and therefore less likely that a predator would eat them for dinner. If that environment made survival more likely if a squirrel has black fur a lot of the time then, over time, more black furred squirrels would survive and thus have more black fur baby squirrels. Over time black fur would be in the majority. As the environment change it would stop being an advantage so either a fur color with more advantage would dominate, or if there was no survival preference on fur color then it would be a mix with black fur in the minority. Most places squirrels hang out at, under trees and in parks, have dappled light and you will see that most squirrels are gray and may have a little black fur mixed in.....so in dappled light they are less likely to get eaten.Orgin of black squirrels?
Black squirrels and white squirrels are color forms


of the normal-colored species. They are most


likely to occur in squirrel populations that are some


what isolated from other squirrels, as in city parks.


This isolation leads to inbreeding of the population


increasing the likelihood that recessive genes for


black or white color pattern will be brought together. Black seems to be much more common


in such populations than white. I have seen black


squirrels in several different places.

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