The secret life of squirrels in New York City

A recent study has found eastern grey squirrels thrive in New York City's urban environment by adapting their behaviour according to cues from human pedestrians, and mostly by ignoring passers-by.

Grey squirrels stop garden birds using feeders

The presence of grey squirrels at standard, hanging bird feeders cuts the number of birds visiting them by a huge 98 per cent, the latest study reveals.

The spiralling cost of invasive species

Some aliens arrived as stowaways. Others were brought in deliberately, for fun or profit. And others were so tiny that nobody noticed them until way too late.

Nuts at dawn: Britain's squirrels fight for survival

Deep in the heart of England's seemingly peaceful countryside, a fierce battle for survival is being waged between the domestic red squirrel, its tougher grey cousin -- and a new mutant arrival.

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