reply to post by ironbutterflyrusted
It's a classic example of natural selection:
For hundreds of years the speckled moths were at an advantage, they camouflaged well with the trees so they rarely got eaten. Every once in a while a
black one would be born and birds would quickly spot it and eat it because it was not camouflaged.
Then the industrial revolution came along and factories started producing a lot of soot causing the surrounding trees to become black. Now, this time
the black months were excellently camouflaged providing them with an advantage whilst the speckled moths were at a disadvantage. This allowed them to
reproduce more often until the black moths were the dominant ones.
During the latter half of the 20th century, there were laws passed to stop or reduce the amount of soot these factories emitted. This resulted in the
trees losing their covering of soot and the speckled moths were at an advantage again, much to the disadvantage of the black moths. The black moths
were no longer easily camouflaged and were easily spotted and eaten. The speckled moths were camouflaged again causing them to be in the
majority
edit on 12/5/2011 by Griffo because: (no reason given)
