But these animals clearly performed way beyond Darwin's expectations.

Eddie planned to charge people to see the animals perform.

These animals are typically displayed but might also perform in a show.

Both animals and humans perform all their natural functions quite explicitly.

Grant knew animals often performed such mating rituals for hours at a time.

Once the animal had performed the desired response they were allowed to escape and were also given a reward, usually food.

We have to get the animals to perform before we replace their faces for dialogue.

If displacement activities really are irrelevant, why do animals perform them?

Why do animals perform their restrained ritual contests rather than fighting all out straight away?

Because they wanted to stress conservation issues, many large zoos stopped the practice of having animals perform tricks for visitors.