Nasty by Nature: disgusting animal habits

From vomiting at attackers to squirting blood from their eyeballs, a new documentary examines the most revolting activities in the animal kingdom

Extraordinary footage of the moment a Horned Lizard expelled a stream of blood from its eyes, warding off an attack from a dog, is one of the highlights of a documentary called Nasty by Nature being screened tonight on Nat Geo Wild.

From rolling around in faeces to vomiting on themselves, the documentary examines some of the weirdest and most revolting activities animals perform in order to survive.

Click here to see the most disgusting in pictures

Nasty by Nature airs Friday 25 March at 9pm on the Nat Geo Wild