Researchers believe the difference in how dogs and cats respond to humans needing help are linked to their evolutionary history.

Learn how dogs, cats, and toddlers were tested for spontaneous helping behavior — and why evolution may explain why most dogs ...

Dogs often help humans like toddlers do, while cats tend to stay independent. Researchers say evolution may explain the ...

Lumi has spent a long time just watching the new kitten from across the living room rug. Living in a big New York apartment ...

“He’s truly convinced that he is a cat," the caption said.

Domestic dogs, wolves and coyotes can also breed with each other. Horses and donkeys interbreed. A mule is a cross between a female horse (called a mare) and a male donkey (a jack). A hinny results ...