Killings sometimes occur in communities across Africa PORTLAND, Ore. - In a cooperative venture aimed at understanding the most uncooperative of acts, researchers studying different African communities of wild chimpanzees have pooled their data and found that the apes sometimes kill each other nearly everywhere they've been studied.

Molting cleanses water fleas Losing a carapace means also losing parasitic bacteria Web edition : Wednesday, April 11th, 2012 Getting naked may help to protect a species of tiny water flea. When Daphnia magna molts, its discarded body armor can carry away harmful bacteria, a new study finds.

Size doesn't matter for crayfish's one-two crunch Biological deception may give crustaceans an advantage during a fight Web edition : Wednesday, March 14th, 2012 When it comes to male crayfish, not all claws are created equal.

Gifford Miller, a paleoclimatologist and geologist at the University of Colorado Boulde

Case Western Reserve University School of Medicine in Cleveland