How species are formed and how species remain separate are crucial questions in evolutionary biology. The offspring of crosses between different animal species are often infertile or die when still in ...

Add Yahoo as a preferred source to see more of our stories on Google. The cooing birds that many have sung about at Christmas are once again a hot topic. The Guardian reports that U.K.

A biologist has shown that bastard doves can fend for themselves. Despite having a strange coo, hybrid offspring are still able to defend their territory. This is necessary for further reproduction.