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 ¿ìè¶ÌÊÓÆµ
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 ¿ìè¶ÌÊÓÆµ