From A Thrilling Wonder:
Not all beautiful frogs depicted here are poisonous, but those who are – can be very deadly indeed. The most poisonous animal is not a snake or a spider. It’s a beautiful little frog! “Most frogs produce skin toxins, but the dart poison frogs from Central and South America are the most potent of all. The golden poison frog, called terribilis (the terrible), is so toxic that even touching it can be dangerous.
Thanks to Bibi from Bibi’s Box for this link to the American Museum of Natural History’s colorful frog page.