Is ainm coitianta ar roinnt speiceas d'éin uisce é lacha.
Ní grúpa tacsanomaíochta iad na lachain — cuimsíonn siad an fhine Anatidae in éineacht leis na géanna agus na healaí.
Tá an lacha agus an ghé cosúil lena chéile freisin. Tá goba ag an dá cheann acu a ligeann dóibh bia difriúil a ithe. Cabhraíonn gob na lachan léi nuair a bhíonn sí ag lorg bia san uisce agus ligeann gob na gé di féar a phiocadh suas. Tá cosa scamallacha ag an lacha agus ag an ngé agus cabhraíonn siad leo bheith ag snámh.
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