Four-eyed fishes, or Anablepidae, are a small group of freshwater and
brackish water fishes living on river estuaries in Central and South America. They are unique in having eyes raised
above top of head and divided in two different parts, so that they can see below and above the water surface at the same time.
They also bear live young, and curiously can/do only mate on one side, right-"handed" males with left-"handed" females and vice
versa [1]. There
are three genera and nine species.
See also
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