The adult rosy starling adults and its young feed on insects during the breeding season, particularly locusts and grasshoppers. There are accounts of the rosy starling feeding on the larvae of the winter moth (Operophetra brumata), which is considered to be a significant agricultural pest. Upon fledging, the rosy starling eats fruit, such as grapes and mulberries. In line with the wider range of habitats that the rosy starling occupies in the winter, it shows a broadening of diet to include seeds and nectar, and a wider range of fruit including cherries, apricots, dates and even chillies (2).
The relatively short breeding season of the rosy starling begins in May to June in most parts of its range, and is tightly associated with abundance of locusts and grasshoppers. Courtship and mating occur on the ground. The rosy starling usually builds its nest hidden in holes and crevices, such as gaps between rocks in scree slopes or abandoned holes made by other species, although occasionally nests are exposed. The nests are made of grass and twigs, with a lining of feathers and finer grass (2). Wormwood and giant fennel are occasionally used in nest lining, possibly due to their insecticidal properties (2).
The rosy starling lays between three and six pale blue eggs, although clutches of up to ten eggs have been reported. Large clutch sizes are probably due to two females sharing the same nest. The male and the female take turns incubating eggs for a period of about two weeks and,- after hatching, the chicks remain in the nest for about 24 days, fed by both adults (2).
The rosy starling is a highly social bird, feeding and migrating in flocks, breeding colonially, and roosting communally. Even in dense colonies, it will rarely show aggression toward other individuals. During the breeding season, flocks of rosy starling can reach numbers of tens to hundreds, but during migration, flock size varies from tens of hundreds to thousands. The rosy starlings will also form large groups and roost with other species such as other starlings, mynas, parakeets and crows (2).