Birds 'off the pace' with warming

French birds are moving northwards in response to climate change, but not fast enough, scientists have found.

Their data came from a large survey in which volunteer ornithologists counted more than 105 species of bird.

In the Royal Society journal Proceedings B, researchers say that the birds are lagging some 182km behind the increases in temperature.

This lag may be of particular concern to rare birds or species that have very specific food requirements.