Is éard atá i gceist leis an ibis ollmhór ná éan ísealchríocha a tharlaíonn i marshes, swamps, lochanna, aibhneacha leathan, clóis tuilte agus foraoisí leath-oscailte chomh maith le linnte, lochanna agus uisce-meadows séasúracha i bhforaois dlúth-leithid.
marshes, swamps, lakes, wide rivers, flooded plains and semi-open forests as well as pools, ponds and seasonal water-meadows, marshes, swamps, lakes, wide rivers, flooded plains and semi-open forests as well as pools, ponds and seasonal water-meadows