The European robin (Erithacus rubecula), known simply as the robin or robin redbreast in the British Isles, is a small insectivorous passerine bird that belongs to the Old World flycatcher family Muscicapidae. It is found across Europe, east to Western Siberia and south to North Africa; it is sedentary in the west and south of its range, and migratory in the north and east of its range where winters are harsher.
It is 12.5–14.0 cm (4.9–5.5 in) in length; the male and female are identical in plumage, with an orange-toned red breast and face lined with grey, brown upper-parts and a whitish belly. Juveniles are distinct, freckled brown all over and without the red breast; first-winter immatures are like the adults, except for more obvious yellow-brown tips to the wing covert feathers (inconspicuous or absent in adults).
The adult European robin is 12.5–14.0 cm (4.9–5.5 in) long and weighs 16–22 g (0.56–0.78 oz), with a wingspan of 20–22 cm (8–8.5 in). The male and female bear similar plumage: an orange breast and face (more strongly coloured in the otherwise similar British subspecies E. r. melophilus), lined by a bluish grey on the sides of the neck and chest. The upperparts are brownish, or olive-tinged in British birds, and the belly whitish, while the legs and feet are brown. The bill and eyes are black. Juveniles are a spotted brown and white in colouration, with patches of orange gradually appearing.
The robin occurs in Eurasia east to Western Siberia, south to Algeria and on the Atlantic islands as far west as the Central Group of the Azores and Madeira. It is a vagrant in Iceland. In the southeast, it reaches Iran and the Caucasus range. Irish and British robins are largely resident but a small minority, usually female, migrate to southern Europe during winter, a few as far as Spain. Scandinavian and Russian robins migrate to Britain and western Europe to escape the harsher winters. These migrants can be recognised by the greyer tone of the upper parts of their bodies and duller orange breast. The continental European robins that migrate during winter prefer spruce woods in northern Europe, contrasting with its preference for parks and gardens in Great Britain.
In southern Iberia, habitat segregation of resident and migrant robins occurs, with resident robins remaining in the same woodlands where they bred.
The robin is diurnal, although it has been reported to be active hunting insects on moonlit nights or near artificial light at night. Well known to British and Irish gardeners, it is relatively unafraid of people and drawn to human activities involving the digging of soil, in order to look out for earthworms and other food freshly turned up. The British and Irish considered robins to be a gardener's friend and would never harm them, due also to the traditional association of the red colouring of their breasts with the blood of Christ. In continental Europe, on the other hand, robins were hunted and killed as were most other small birds, and are therefore more wary. Robins also approach large wild animals, such as wild boar, which disturb the ground, to look for any food that might be brought to the surface.
In autumn and winter, robins will supplement their usual diet of terrestrial invertebrates, such as spiders, worms and insects, with berries, fruit and seeds. They will also eat seed mixtures and suet placed on bird-tables, as well as left-overs. The robin is even known to feed on small vertebrates (including fish and lizards) and carrion.
Male robins are very territorial and will fiercely attack other males and competitors that stray into their territories. They have been observed attacking other small birds without apparent provocation. There are recorded instances of robins attacking their own reflection. Territorial disputes sometimes lead to fatalities, accounting for up to 10% of adult robin deaths in some areas.
Because of high mortality in the first year of life, a robin has an average life expectancy of 1.1 years; however, once past its first year, life expectancy increases. One robin has been recorded as reaching 19 years of age. A spell of very low temperatures in winter can, however, result in higher mortality rates. The species is parasitised by the moorhen flea (Dasypsyllus gallinulae) and the acanthocephalan Apororhynchus silesiacus.
