Pallas’s gull arrives at its breeding colony in early March. The dense breeding colonies of this species consist of 70 to 3,000 pairs, with each pair nesting around 40 centimetres apart. Pallas’s gull has a distinctive courtship display, which involves raising the feathers on its back and releasing a howling long call (2).
The nest of Pallas’s gull is made of dried aquatic plants and feathers (2), and is situated in a shallow depression (5). Two eggs are typically laid in April, and the eggs are incubated for around 25 days, primarily by the female. Pallas’s gull chicks, which are creamy-buff or silvery-white, may leave the nest after around five days. Pallas’s gull typically first breeds at four or five years of age (2).
Outside of the breeding season, Pallas’s gull usually remains solitary or occurs in small parties of two to three individuals, although it will aggregate in large groups in areas where fish are abundant (5).
Pallas’s gull is an omnivorous bird, although its diet is dominated by animal material (5). It mainly feeds on fish, particularly dead fish, and crustaceans, as well as insects, small mammals, birds, eggs and reptiles. In cooler weather, this species may feed on seeds (2). Pallas’s gull has been observed following fishing boats and scavenging in harbours for a meal, and is also known to fly long distances from its colony in the breeding season to feed on swarms of insects (5).