True, but it's humans that interfered with them in the first place
...we didn't have grey squirrels until some bright spark decided to let some go...the same with Terrapins...the Teenage Mutant Ninja Turtle craze in the 80's encouraged children to keep them as pets not knowing how big they would get or that they live long lives and soon got bored of them...thus leading to parents letting them go in park ponds etc....it's not the animals fault, it's humans
...P.S...I never moan about grey squirrels, I love them
