The diet of the redwing includes of a variety of invertebrate prey, including beetles, flies, caterpillars, bugs, dragonflies, grasshoppers and crickets, spiders, millipedes, small crabs, molluscs and earthworms. In autumn and winter, it also eats a range of seeds, berries and other fruits, including ivy, holly, juniper, apple, buckthorn, currants (Ribes), bramble, elder and rowan (2).
The redwing breeds between April and July (2) (6) (7), building the nest in a variety of locations, including in trees, shrubs, on the ground in thick vegetation, on tree stumps, in tree hollows, or on buildings (2) (3) (7). Although it usually nests in solitary pairs, the redwing may sometimes form loose colonies, sometimes close to colonies of fieldfares (Turdus pilaris) (2) (3).
The nest of this species consists of a bulky cup of grass, moss and twigs, bound together with mud and vegetation and lined with grass and leaves. The female redwing usually lays between 4 and 6 eggs, which hatch after an incubation period of 10 to 14 days. The young redwings leave the nest at around 12 to 15 days old, but are dependent on the adults for a further 2 weeks. The male redwing will sometimes continue to feed the young while the female begins laying a second clutch of eggs (2).