They stand more than grey squirrels, so they are noticed more and get killed by predators. The population of red squirrels dropped and the grey squirrels passed on grey genes to their offspring. This is repeated over generations.
Hey presto!
You have more grey squirrels than red!
The main factor is that the Grey Squirrels came over to the UK (I'm not sure where from) and started eating more food then was fair for them, obviously not intentionally because animals don't think in that way. This meant there was a lack of food for the Red Squirrels, and so they became very rare. Although they can still be seen (if you're lucky!) in a few woodlands in the West Country and Scotland.
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Thanks,
DB9
EDIT:
Although the Grey's eat more food than the Red's, this is intentional, as it's part of their competitive nature. Also the introduction of Grey's from America brought the Squirrel Poxvirus with them, which is another large factor to the decline of the Red Squirrel population.
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