A heartwarming video has showcased the way a deaf dog has built up a way to communicate with her owners, despite not being able to hear. Faith, a 3-year-old mixed breed, was born deaf, but owner Nikki ...

In the 1970s a young gorilla known as Koko drew worldwide attention with her ability to use human sign language. But skeptics maintain that Koko and other animals that “learned” to speak (including ...