Justification Justification of Red List Category This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence 30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern. Ecology Behaviour Northern populations of this species are migratory, with those breeding in the western Palearctic travelling on a broad front across the Sahara (del Hoyo et al.

1992) and those breeding in North American travelling on a narrow front along the Atlantic and Pacific coasts (Kushlan and Hancock 2005). Post-breeding southward movements occur from September to October and return northward movements occur from March to May (Kushlan and Hancock 2005). Tropical populations are not migratory but may undergo seasonal post-breeding dispersive movements (del Hoyo et al. In temperate regions breeding occurs in the local spring, with tropical and subtropical nesting generally coinciding with the rains (Kushlan and Hancock 2005).

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The species usually nests in small numbers (Snow and Perrins 1998) in single- or mixed-species colonies (del Hoyo et al. 1992), although sometimes groups may reach several thousand pairs (del Hoyo et al. When nesting within mixed-species colonies the species tends to form monospecific clusters (Kushlan and Hancock 2005). The species's aggregatory behaviour outside of the breeding season varies much throughout its range, some populations (e.g.

In America) remaining highly gregarious throughout the year (Snow and Perrins 1998) and gathering in flocks of hundreds or even thousands to roost (del Hoyo et al. 1992), others (e.g. Palearctic breeders) being largely solitary except when roosting or on migration (Snow and Perrins 1998) (roosting flocks of 2-6 to 200 are known in Africa (Brown et al. 1992) and small flocks occur on migration) (del Hoyo et al.

The species is largely crepuscular and nocturnal, but may feed diurnally especially during the breeding season (del Hoyo et al. Habitat The species inhabits fresh, brackish or saline waters with aquatic vegetation and bamboo or trees (e.g. Pine, oak or mangroves) for roosting and nesting in (del Hoyo et al. 1992), showing a preference for islands or predator-free areas for nesting sites (Kushlan and Hancock 2005).

It occupies the forested margins of shallow rivers, streams, lagoons, pools, ponds, lakes, marshes and mangroves and may feed on pastures, reservoirs, canals, aquaculture ponds (del Hoyo et al. 1992) and rice-fields (up to 96% of a colony's food resources may be taken from nearby rice-fields) (Kushlan and Hancock 2005). On migration the species may also frequent dry grasslands or marine coasts (del Hoyo et al. 1992), kelp beds (Kushlan and Hancock 2005) and estuaries (Hockey et al. It breeds up to 4,800 m (Chile) (Kushlan and Hancock 2005) but is more common at elevations of up to c.2,000 m (Snow and Perrins 1998).