It is generally non-vocal, but the voice is probably similar to that of the African Sacred Ibis. Apart from its occurrence on Aldabra, the Malagasy sacred ibis is sparsely distributed along and restricted to the west coast of Madagascar, especially between Port-Berge and Moromoe. Although uncommon, some high densities of resident breeding populations have been observed in mangroves and estuaries near Soalala and Sahamalaza Bay and Baie de Baly; the region encompassed between these locations appears to be a species’ stronghold. The Malagasy sacred ibis is generally restricted to coastal mudflats, estuaries, mangrove swamps and shallow brackish coastal lakes; but is occasionally found on freshwater wetlands. It preferentially frequents wide, open pools without surrounding vegetation; as well as sand bars and sandy beaches for general resting places. In one survey, over 80% of individuals recorded were found within 2 km of the coastline. Its habitat is situated 0-150m above sea level. This species is considered more ecologically restricted than its mainland African counterpart, which is found in a wider range of habitats at a wider range of altitudes. The Malagasy sacred ibis feeds on crustaceans, diverse invertebrates, vegetable refuse and more occasionally takes frogs, reptiles and young birds. It forages mainly on mud in tidal areas, thrusting its bill into the mud up to the eyes. The "abbotti" race on the Seychelles feeds in coral pools and along lagoon shores (King, 1981 in Hancock). Feeding is often solitary, although some individuals have been observed foraging in pairs or threes. Egg-laying occurs at the beginning of the wet season in November and December. The clutch size is usually 2 eggs. Average egg measurements for "T.a. abbotti" have been reported as 59.5mm long and 41.3mm broad and weighing 55g. This ibis nests colonially, sometimes with mixed heron species such as the Humblot’s heron  or egret species such as cattle egret and dimorphic egret. The nest lies 2-3m above the surface of the water in forks of "Avicennia" and "Rhizophora" trees and largely comprises twigs, some of which are still living with leaves attached. The nest is structurally sturdy and measures 450-500mm across and 250mm deep.