Reuters - Wed Mar 22, 6:43 AM ET
A blue poison frog (Dendrobates azureus) sits on a leaf 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/Siggi Bucher
