A cloaca /kloʊˈeɪkə/ is the posterior orifice that serves as the only opening for the intestinal, re
A cloaca /kloʊˈeɪkə/ is the posterior orifice that serves as the only opening for the intestinal, reproductive, and urinary tracts of certain animal species, opening at the vent. All amphibians, birds, reptiles, and a few mammals (monotremes, tenrecs, golden moles, and marsupial moles) possess this orifice, from which they excrete both urine and feces. Among fish, a true cloaca is present only in elasmobranchs (sharks and rays) and lobe-finned fishes. In lampreys and in some ray-finned fishes, part of the cloaca remains in the adult to receive the urinary and reproductive ducts, although the anus always opens separately. In chimaeras and most teleosts, however, all three openings are entirely separated. -- source link
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