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Most species of poison dart frogs are small, sometimes less than 1.5 cm (0.59 in) in adult length, although a few grow up to 6 cm (2.4 in) in length. They weigh 1 oz. on average. Most poison dart frogs are brightly colored, displaying aposematic patterns to warn potential predators.oison dart frogs are endemic to humid, tropical environments of Central and South America. These frogs are generally found in tropical rainforests, including in Bolivia, Costa Rica, Brazil, Colombia, Ecuador, Venezuela, Suriname, French Guiana, Peru, Panama, Guyana, Nicaragua, and Hawaii (introduced).
1 Tiny poison dart frogs may only be one inch (2.5 centimeters) long, but they pack a powerful punchâof poison. 2  Weighing less than an ounce (28 grams), these frogs are considered one of Earth's most toxic, or poisonous, species. 3  For example, the golden poison dart frog has enough poison to kill 20,000 mice. Like all frogs, poison dart frogs are amphibians, a group of animals that includes toads and salamanders. 2  Poison dart frogs eat insects, including flies, crickets, ants, termites, and beetles. 3  A group of frogs is sometimes called an army.