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.

Arctic ground squirrels muscle up to hunker down

When Arctic ground squirrels are getting ready to hibernate they don't just get fat – they pack on muscle at a rate that would make a bodybuilder jealous. And they do it without suffering the harmful effects that high ...

Study sheds new light on deadly squirrel pox virus

(PhysOrg.com) -- Bird tables which bring red and grey squirrels into close contact could be contributing to the spread of the squirrel pox virus by creating a 'hotspot' for the disease.

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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