African crested rat

The African crested rat has a unique way of deterring predators. It licks the bark from a poisonous tree (the same one native hunters use to poison their darts), and licks it onto its fur. Any predator that tries to eat the rat becomes very sick, and quickly learns to keep its distance. This kind of defense has been seen in other animals, but is the first known case of a mammal using a substance from another organism to make itself toxic to predators. Is it a classic case of evolution?