Researchers have uncovered a direct link between global temperatures and body size, leading them to conclude that future climate change could mean species getting smaller. A team led by scientists from the University of Florida and the University of Nebraska followed the evolution of the earliest horses about 56 million years ago, and found that as temperatures increased, their body size decreased. "Horses started out small, about the size of a small dog like a miniature schnauzer," says Jonathan Bloch, associate curator of vertebrate paleontology at the Florida Museum of Natural History. "What’s surprising is that after they first appeared,...