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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).
Poison Dart Frog Size. Poison dart frogs can be divided up into two or three different size groups. The species that are most popular in the hobby are medium to larger size poison dart frogs. As adults, these frogs are generally about the size of a large grape, or around one and a half inches in length.aby poison dart frogs, or frogs up to around six weeks old, are only about a half inch long, and should be avoided. These small frogs will be more difficult for the beginner to get established, and are generally more fragile.