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A Psyllophyrne didactyla, known as the flea-toad, rests on the nail of a small finger on August 17, 1998 in the University of Rio de Janeiro, Brazil. Considered the smallest vertebrate in the world, this toad, which measures less than 10 millimiters is being used by scientists at the University of Rio de Janeiro as a measure of how much the Atlantic rain forest is being destroyed. This toad is highly suceptible to changes and it's population in the rain forest is being analyzed. according to the team studying the toad, everytime the rainforest is diminished, the toads population decreases considerably.(AP Photo/Carlos Frederico Rocha)

Tiny animals

A look at some of our planet’s smallest creatures.