New study traces the evolutionary history of what mammals eat. National Evolutionary Synthesis Center, April 16, 2012. The feeding habits of mammals haven’t always been what they are today, particularly for omnivores, finds a new study. Some groups of mammals almost exclusively eat meat — take lions and tigers and other big cats. Other mammals such as deer, cows and antelope are predominantly plant-eaters, living on a diet of leaves, shoots and bark. But particularly for omnivores, the situation wasn’t always that way, researchers report. Picked up by NSF and NPR.

Athletic frogs have faster-changing genomes. National Evolutionary Synthesis Center, April 12, 2012. Physically fit frogs have faster-changing genomes, says a new study of poison frogs from Central and South America. Also featured in Wired Magazine.

How did human brains get to be so big? Scientific American Guest Blog, February 21, 2012. New research points to an ancient energy tradeoff that meant more fuel for brains, and less fuel for muscles.

Birds in uncertain climates are more likely to stray from their mates. National Evolutionary Synthesis Center, February 16, 2012.  Married people may pledge to stay faithful through good times and bad, but birds sing a different tune — when weather is severe or uncertain, a new study finds that birds are more likely to stray from their mates. The results could mean more marital strife for birds coping with climate change, the researchers say. Picked up by Discovery News, Huffington Post, Scientific American, Globe and Mail, the New York Times, and MSNBC.