Uninzi lwezilwanyana luhlala kuhlobo olunye lwe-environment kuba kuzezona zingqinelana nazo. Sithi zi-'adapted' kwi-environment'. Umzekelo, izilwanyana ezifana namasele, ii-newts, namadada, zinoobhaxa beenyawo ezizinceda zitsho zikwazi ukudada emanzini. Ziziintlobo ngeentlobo ke ii-habitats kwaye zikwaziintlobo-ntlobo iindawo ezikwazi ukuphila kuzo.