A gill ( ) is a specialized respiratory organ that many aquatic animals use for aquatic gas exchange, i.e. to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some semi-aquatic species (e.g. crabs, terrestrial hermit crabs and amphibious fishes), have also adapted to allow air respiration (breathing) on land provided the gills are kept moist. Branchia (pl.: branchiae, from Ancient Greek βράγχια) is the zoologists' academic name for gills.
https://en.wikipedia.org/wiki/Gill
A gill ( ) is a specialized respiratory organ that many aquatic animals use for aquatic gas exchange, i.e. to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some semi-aquatic species (e.g. crabs, terrestrial hermit crabs and amphibious fishes), have also adapted to allow air respiration (breathing) on land provided the gills are kept moist. Branchia (pl.: branchiae, from Ancient Greek βράγχια) is the zoologists' academic name for gills.
