Watch: Endangered Mexican Wolf Pups Enjoy Play Time

PLAYFUL PUPS: Eight Mexican wolf pups played among the rocks in their enclosure at the Museum of the Desert in Saltillo, Mexico on July 2. They were born in April and are part of the museum's fifth litter. This species of wolf is endangered. There are only about 30 of them left in the wild in Mexico, according to the museum. But several hundred Mexican wolves have been bred in captivity by conservation programs.