In the summer of 1989, Jack Dumbacher was a fresh-faced ornithologist-in-training on his maiden expedition to the lush rainforests of Papua New Guinea. One sticky afternoon, he noticed an unusual bird ...

Some animals are venomous, meaning they create their own toxins that can sicken, paralyze or kill when injected via fangs or a stinger. But there's another category of toxic creature: those that are ...