Brian Gratwicke / Flickr / CC BY 2.0
The red-backed poison frog is the second most poisonous in its genus, right behind the variable poison frog.17
While the toxicity of this frog is quite a bit less than the variable, it can still kill smaller predators like birds and can cause serious injury to humans.18 You can thank ants because this frog gets its toxicity from the neurotoxic venom of the ants it eats. This is one of the smaller species of poison dart frogs and is native to the Amazon rainforests of Peru and Ecuador.