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The Paedocypris carp is the smallest known fish in the world, found in the
peat swamps of Sumatra in 2006. Adults grow only to about 7.9 millimeters.
This unusual species has a rudimentary skull which leaves the brain exposed,
and it feeds primarily on plankton. Scientists warn that the species is at great
risk of extinction due to the destruction of Indonesian peat swamps for palm oil plantations.