Living along the coast in areas of high human activity, the Caspian gull has become an opportunistic feeder, following fishing boats and taking fish offal, as well as foraging on rubbish tips (6). In areas where human activity is less prevalent, adults feed on a range of organisms from invertebrates to other bird’s eggs and chicks. This species diet can vary between colonies, with the Caspian Sea colony also feeding on small rodents and mole-crickets (2).
The Caspian gull’s breeding strategy is similar to that of the herring gull. Breeding occurs from mid March to April, and colonies comprise approximately 8,000 pairs on high ground, often far from water (2). Breeding colonies usually contain a mixture of species with clusters of the same species within (2). It typically nests under bushes, building its nest from feathers, vegetation and nearby debris. Usually 2 to 3 eggs are laid, and the female incubates the clutch for 26 to 29 days. The chicks are fledged at six to seven weeks (2).
This species is migratory and, outside of the breeding season, it moves to its wintering grounds which include coast of southwest Asia, the northwest coast of Africa, and from the Arabian Peninsula up to northwest India (2).