Frans de waal

If one bird foraging in a flock on the ground suddenly takes off, all other birds will take off immediately after, before they even know what's going on. The one who stays behind may be prey.

Female bonobos form a strong sisterhood. They rule through female solidarity.

Although elephants are far more distantly related to us than the great apes, they seem to have evolved similar social and cognitive capacities.

The primate laugh is given in playful contexts, and as such has a strong similarity to the human laugh.

Exclusive homosexuality is not very common in nature.

I think we need to start thinking about grounding our moral systems in our biology.

Personally, I think it is possible to build a society that is moral on a nonreligious basis, but the jury is still out on that.

The whole reason people fill their homes with furry carnivores and not with, say, iguanas and turtles, is because mammals offer something no reptile ever will. They give affection, they want...

Darwin wasn't just provocative in saying that we descend from the apes - he didn't go far enough. We are apes in every way, from our long arms and tailless bodies to our habits and temperament.

Dogmatists have one advantage: they are poor listeners.