Shrieker Monkey

The Shrieker Monkey is a species of primate that lives in the rainforest.

Behavior
To get food, the monkey will find any nearby small predators, such as small cats, hyenas, or jaguars, and expel a hormone to send the message that it wants a piece of the predator's catch. The predator must give it a piece, because if it doesn't, the monkey will begin shrieking loudly, attracting larger predators who will eat all of the smaller creature's prey, if not the creature itself.

If the creature decides to take its catch and run, the monkey will follow it through the canopies of the trees, continuing to vocalize loudly. Thus, running away from the monkey causes only more pain for the predator.