A golden poison frog (Phyllobates terribilis) sits on a branch in the zoo of Zurich, March 22,2006. The skin of an adult golden poison frog has enough toxin to kill 20.000 mice or 100 adult humans. With the destruction of its rainforest habitat the golden poison frog's future status for survival is unsure.[Reuters]

A blue poison frog (Dendrobates azureus) sits on a branch in the zoo of Zurich, March 22,2006. The blue colour of this South-American frog serves as a warning to would-be predators, its skin is covered with glands that secrete alkaloid poisons capable of paralyzing and even killing predators. With the destruction of its rainforest habitat the blue poison frog has become one of the most threatened of all poison dart frogs. [Reuters]

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