LifeMigrating birds may be paler colours to help them keep cool Overheating is a serious issue for birds flying long distances, and paler plumage that reflects more of the sun's heat may be one of the ways they cope 51¶¯Âþ
LifeMystery of ancient burrows older than earliest animals has been solved Ancient animal burrows in rocks once thought to be 1.2 billion years old have been re-examined, and were likely made 40 to 50 million years ago by crustaceans 51¶¯Âþ