When it comes to choosing a pet, a rat probably isn’t high on most people’s lists. In fact, rats are probably more often identified as vermin than companion animals. But a growing number of people are choosing rats as pets, and find the much-maligned rodents to be affectionate and intelligent companions. Dr. Javier Nevarez, assistant professor of zoological medicine at the Louisiana State University School of Veterinary Medicine, discusses why a rat makes a surprisingly good choice for a pet.