Dogs are known for their diversity of size and shape, but even knowing this, the largest dog ever is on another level ...

Prairie dogs live in underground burrows, extensive warrens of tunnels and chambers marked by many mounds of packed earth at their surface entrances. Burrows have defined nurseries, sleeping ...

Later, around ten million years ago, North American mammals—camels, horses, and dogs—began to arrive. Almost every animal that roams the Serengeti today is a relative newcomer to the continent.