Many frogs contain mild toxins that make them unpalatable to potential predators. Some of them, such as some poison dart frogs, are especially toxic. The chemical makeup of toxins in frogs varies from irritants to hallucinogens, convulsants, nerve poisons, and vasoconstrictors. Many predators of frogs have adapted to tolerate high levels of these poisons. Others, including humans, may be severely affected.
The next pics show some deadly poisonous frogs.
Blue Poison Dart Frog (Dendrobates azureus)
Dendrobates azureus is a species of poison dart frog found in the forests surrounded by the Sipaliwini savannah, which is located in southern Suriname and northern to central Brazil. Dendrobates azureus is widely known as the blue poison dart frog or by its Tirio Indian name, okopipi.
Lovely Poison Frog (Phyllobates lugubris)
This a species of frog in the Dendrobatidae family. It is found in Costa Rica, Nicaragua, and Panama. Its natural habitats are subtropical or tropical, moist, lowland forests, rivers, plantations , and heavily degraded former forest. It is threatened by habitat loss.
Golden Poison Frog
Phyllobates terribilis, is a poison dart frog endemic to the Pacific coast of Colombia. The optimal habitat of this, is the rainforest with high rain rates (5 m or more), altitude between 100–200 m, temperature of at least 26 °C, and relative humidity of 80–90%.
Dyeing Dart Frog
Is a species of poison dart frog. It is the third largest species, reaching lengths of 50 millimetres (2.0 in). This species is distributed throughout the eastern portion of the Guiana Shield, including parts of Guyana, Suriname, Brazil, and nearly all of French Guiana.
Strawberry Poison Dart Frog
(Oophaga pumilio is a species of small amphibian poison dart frog found in Central America. It is common throughout its range, which extends from eastern central Nicaragua through Costa Rica and northwestern Panama.