Lots of domestic animals are crossbred to make new breeds. Among dogs, for instance, a Siberian retriever is a cross between a Siberian husky and a Labrador retriever, while a cockapoo is a cocker ...

For more on big cats, tune in to Big Cat Week, premiering Monday, Feb. 20, at 9/8c on Nat Geo WILD and learn more about the National Geographic Big Cats Initiative, a global initiative that supports ...