Whether mimicking sounds or communing with each other, animals prove over and over again that they are deeply intelligent.
Koko the gorilla learned more than 1,000 signs based on American Sign Language.
"Koko: A Talking Gorilla" is a 1978 documentary that introduced Koko to the world.
Source: youtube.com
A beluga whale imitating human speech.
Not only can they speak, but beluga whales put most of us to shame with their dance moves.
Source: youtube.com
Praire dogs use a very complex language to describe specific predators.
Source: youtube.com
Carl Sagan says one whale song has as much information content as "The Iliad" or "The Odyssey."
Source: youtube.com
