Over the course of the history of life on Earth, animals have developed all kinds of unique and bizarre defense mechanisms. But the line between "poisonous" and "venomous" is often the most ...

There are currently only two species of frog known to be venomous: Bruno's casque-headed frog (Aparasphenodon brunoi) and Greening's frog (Corythomantis greeningi). Both are found in Brazil and ...