It might sound like a gardener's worst nightmare - but 'very hungry caterpillars' should be left to feast on plants this spring, conservationists say.

Michigan’s largest bat colony is defying a disease that has killed millions of bats across the U.S. and Canada over the last 20 years.

Even at levels safe for humans, air pollution can disrupt the way some insects communicate with plants, and with each other.

Billions of birds that once filled North American skies have disappeared, and new science shows they are disappearing faster than ever.