Moody Beasts

Why would a bull moose cover himself in his own urine? Why would a clownfish change his sex on cue? Why would a marsupial mouse push himself to have sex until he dies?

All creatures, including us humans, are consumed by the answer. It's the powerful and mysterious chemical cocktail that's the rocket fuel of life-hormones.

We explore the secret, primal force that drives the animal kingdom.