Non-venomous snake sequesters venom from a toad

Pretty crazy. This snake, Rhabdophis tigrinus, of Japan is resistant to a species of toxic toad. After eating the toad, the snake is able to maintain the toxins in its neck glands and use them a chemical defense.

Here's the link:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1892995/