"Long drawn-out meows and hissing convey agitation and aggression," Dr. Humm-Beatty says. "Short trills or quiet meows ...

Yes, cats can show you a lot more than a little respect.

Cats rarely speak the way humans expect them to. They do not explain, announce, or warn in clear words. Instead, they communicate through a quiet, layered langu ...

Even the experts can’t teach a gorilla to be a mother — that comes from the heart. In a video posted this week by her caretakers, Koko the gorilla — famous for her knowledge of modified American Sign ...