Gill
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Gills are what fish, amphibians, and some other animals use to breathe in water. They have feathery parts that water moves across, which contains dissolved oxygen. The oxygen is absorbed into the animal's blood. When this happens, carbon dioxide moves out of the animal's blood and into the water.
Fish and frog gills are hidden on the sides of their heads. Sharks have many gills slits on their necks. Baby salamanders have gills that stick out like leaves from their heads.
In mushrooms, gills are the spore-bearing structure in agarics (gilled mushrooms).
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