Humans are far more monogamous than our primate cousins, but less so than beavers, a new study suggests. Researchers from the University of Cambridge in England analyzed the proportion of full ...

Since the Middle Ages, the size of wild and domestic animals has largely been shaped by human selection: domestic animals are increasingly larger; wild animals increasingly smaller. During the 7,000 ...

Q. My brother (a basketball player) says giraffes are the biggest land animals because they are the tallest. How do scientists determine what the biggest animals are? A. Scientists, as well as people ...