The screams are often made by vixens (female foxes) to attract potential partners or to signal that they are ready to mate. In response, male foxes (dogs) may bark or scream back to communicate their ...

Dan Blumstein was gently holding a yellow-bellied marmot pup, conducting research, when he first heard one scream. "I was sort of shocked by this scream and almost dropped this animal," he says. "I ...