ʻO ka gill he ʻōkana i loaʻa i nā holoholona wai he nui. Pono ʻoe e hanu. Hiki iā lākou ke hoʻohana ia mea no ka loaʻa ʻana o ka oxygen mai ka wai, e like me nā mammals me ko lākou māmā. ʻAʻole pono nā holoholona liʻiliʻi i nā gills. Ua lawa ia lakou ke hanu ma ko lakou ili.
ʻO ka inoa "gill" mai ka huaʻōlelo kahiko no "nick" a i ʻole "notch". Ma lalo o ka microscope, hiki iā ʻoe ke ʻike i nā papa maikaʻi mai kahi ʻili kūikawā a me nā ʻoki i waena. Pono kēia ʻili e maʻa mau no ka mea he mucous membrane ia. Ke ʻike ʻia i ka ea, make koke nā gills a ʻeha ka holoholona.
Loaʻa i nā iʻa a pau nā gills, me ka nui o nā mollusks. ʻO kēia mau mea he snails, mussels, a me nā mea ʻē aʻe he nui. He nui nā ilo a me nā pāpaʻi e hanu ana me nā gills. Hanu wale nā amphibians me nā gills i ka wā e mau ana lākou i nā ʻōpala. Ma hope aku ma ka ʻāina, hanu ka nui o nā amphibian me ko lākou māmā.