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When not breeding European serins are usually seen alone or in pares and also form flocks, sometimes mixed with other finches. They are active and often conspicuous birds. They spend their day walking or hopping on the ground in search of food. They also feed in trees and bushes. The song of European serins is a buzzing trill, very familiar in Mediterranean countries.
European serins are herbivores (granivores) and carnivores (insectivores). Their diet includes mainly seeds, buds, and flowers. During the breeding season, they mainly feed on insects.
European serins are monogamous and form pairs that may nest singly or in loose groups. Their breeding season takes place from February until early August. The female builds the nest in a shrub or tree and lays 3 to 5 eggs. The female incubates the eggs alone for 13-14 days but both parents care and feed the newly hatched chicks. The young start to fly when they are 15-18 days old and become independent 9-10 days later.
