Gill
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Gills are what fish, amphibians, and some other animals use to breathe in water. They have feathery parts which cause water to move across the animal's body, which contains dissolved oxygen, after the animal has swallowed the water. The oxygen is absorbed into the animal's blood, causing carbon dioxide moves out of the animal's blood and into the water through the gills.
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) while fish and some young amphibians use them to get oxygen others breath.
Some insects that live in water have a plastron, which is a kind of gill. It is a patch of special hairs that keeps the water away from the insect's spiracles. This allows them to continue to take in oxygen and remove carbon dioxide while they are under water.
Gill Media
The red gills of this common carp are visible as a result of a gill flap birth defect.
Freshwater fish gills magnified 400 times
The red gills inside a detached tuna head (viewed from behind)
A sea slug, Pleurobranchaea meckelii: The gill (or ctenidium) is visible in this view of the right-hand side of the animal.
Caribbean hermit crabs have modified gills that allow them to live in humid conditions.
