Toxic rat makes its own poison

A species of African rat makes its own poison by gnawing on a toxic tree and smearing the toxic saliva on to hair on its flanks. The Crested Rat, Lophiomys imhausi, is the first mammal ever found to acquire lethal toxins from a plant.

The poison comes from the Acokanthera tree, and has been harvested by human hunters to coat arrows that can kill an elephant.

Read more at University of Oxford