Unlike frogs that depend on being hard to see for protection, poison dart frogs depend on their bright colours to warn their enemies that they're dangerous to eat. Each strawberry poison dart frog contains enough poison to kill 20,000 mice.
Humans can get sick just by touching one's skin.
South American native peoples use the frogs' poison to poison hunting darts. Some kinds of poison dart frogs place their tadpoles in pools in jungle plants. This is where the tadpoles stay until they develop fully into frogs. Poison dart frogs return to their tadpoles many times and leave their own eggs for the tadpoles to eat. No one knows how the frogs remember where their babies have been left.