Izilwanyana zaselwandle ziquka zonke iintlobo zezilwanyana ezihlala ikakhulu elwandle. Ngoko kukho iintlanzi, i<em>starfish, oononkala, iimbaza, ijellyfish, iziponji nezinye ezininzi. Iintaka ezininzi zaselwandle, ngakumbi iipenguins, kodwa nofudo baselwandle bahlala kakhulu elwandle okanye kufutshane nolwandle, kodwa babeka amaqanda emhlabeni. Oomama baseSeal bazalela emhlabeni amantshontsho abo. Zonke ezi zilwanyana zisagqalwa njengezilwanyana zaselwandle.
Ingcamango yendaleko icinga ukuba zonke izilwanyana zantlandlolo zazihlala elwandle. Abaninzi baye baphuma elunxwemeni baza baphuhla ngakumbi apho. Kodwa kukwakho nezilwanyana ezathi kamva zafudukela elwandle emva kokufuduka zisuka elwandle ziye emhlabeni: ookhokho beminenga kunye neentlanzi ezinamathambo ahlala emhlabeni kwaye kamva bafudukela elwandle. Ngoko ke ezi nazo zibalelwa phakathi kwezidalwa zaselwandle.
Ke ngoko akucaci ngokupheleleyo ukuba zeziphi izilwanyana ezizezaselwandle kuba azizalani ngokwendaleko. Oku kufana nezilwanyana zasehlathini. Kukwaxhomekeke kakhulu ekubeni iluluphi na ulwandle. Kufuphi ne-ikhweyitha, amanzi ashushu kunaseArctic okanye eAntarctica. Yiyo loo nto nezinye izilwanyana zaselwandle zihlala apho.