The Coral snake is debatable: it is so deadly that no animal can "learn" by getting bitten by it.
Instead one theory is that the mimicry is in reverse: the coral snake is mimicking the non-fatally venomous "false coral snake" which is also more numerous.
There are a variety of different theories on mimicry, and the science of the coral snake is still debated...
* Rosary Pea
* Coral Snake
* Stag Beetle
* Jerusalem Cherry
* Phantasmal poison frog
* Strawberry poison dart frog
* Bittersweet nightshade berries