These gorgeous frogs are only about 2" (up to 4.5 cm) long. That's small enough to be eaten by some large spiders!
They are one of several different species of "poison arrow" or "poison dart" frogs, so called because their skin toxins are used in blowpipes by the Choco Indians of Colombia, South America.
Did you know that only the wild adult blue poison dart frogs have toxins in their skin? That's because the toxins come from the insects they eat in the wild, and those insects are not part of the diets of the adults in captivity or the baby tadpoles. Why are the insects all full of poisons, you ask? Because they eat plants with poisonous alkaloids. Doesn't that seem to validate the old saying, "You are what you eat?"
Dendrobates azureus is only found in Suriname, according to the Yale Peabody Museum of Natural History.