By Gloria Dickie LONDON (Reuters) – The early bird is getting even earlier. With climate change spurring earlier springs across much of North America, many birds are laying their eggs earlier in the year, according to a new study – adding to mounting evidence that global warming is turning wildlife habits upside down. Of 72 bird species examined around Chicago, roughly a third lay their eggs about 25 days earlier than they did a century ago, researchers report in the paper published on Friday in the Journal of Animal Ecology. Those affected include the mourning dove, American kestrel and Coope…