Eurasian Nuthatch

The Eurasian nuthatch (Sitta europaea) is a compact woodland songbird with a powerful pointed bill, short tail and strong feet. Adults are about 15 cm long and weigh around 22 g. The upperparts are blue-grey, the face is crossed by a bold black eye-stripe and the underparts range from whitish to warm buff or chestnut depending on subspecies and region.

Its shape and movement are as distinctive as its plumage. Nuthatches cling directly to bark and can move confidently upwards, sideways and headfirst down a trunk. Northern populations are generally paler below than many western and southern populations.

Eurasian nuthatches favour mature deciduous and mixed woodland with large, rough-barked trees, especially where natural cavities are available. They also use old parks, orchards and well-established gardens. Oaks, beeches and other mature broadleaved trees can provide both abundant feeding surfaces and large crops of nuts and seeds.

Woodland structure matters as much as any one tree species. Large trunks with fissured bark create many places to search for invertebrates and hide food, while old trees and former woodpecker holes provide nesting cavities. This makes mature, structurally varied woodland particularly valuable.

During spring and summer the diet is dominated by insects, spiders and other small invertebrates found on trunks, branches and foliage. In autumn and winter the birds switch strongly towards seeds and nuts and readily visit feeders where available.

Nuthatches search trunks, branches and foliage while clinging directly to bark with strong feet. Their ability to move headfirst down a trunk lets them inspect bark surfaces from angles that many other trunk-foraging birds rarely use.

Hard food is often carried to a suitable bark crevice and wedged firmly in place before being hammered open with the bill. Seeds and nuts are also cached individually beneath bark, lichen, moss or in other crevices and recovered later. An aviary experiment published in 1997 found that even after eight days, birds located their own hidden seeds faster and more accurately than birds unfamiliar with the cache sites.

Established adults generally remain in permanent pair territories throughout the year, giving them detailed familiarity with feeding, caching and roosting sites in the same woodland area. They are usually seen alone or in pairs, but may join mixed flocks of tits and other small woodland birds during winter.

Eurasian nuthatches breed in existing cavities rather than excavating a complete nest hole themselves. Natural tree cavities, old woodpecker holes and nest boxes are all used. A particularly characteristic behaviour is the use of mud to narrow an entrance that is too large, leaving an opening the nuthatches can use while reducing access for larger competitors and predators.

The female typically lays 6–8 eggs and performs the incubation, which usually lasts about 16–17 days. The male supplies food during this period. Both parents feed the chicks after hatching, and the young normally remain in the cavity for about 24–25 days before fledging. One brood is typical, although a second can occasionally occur.

The Eurasian nuthatch is classified as least concern on the IUCN Red List. It has a very large Palearctic range and remains common across much of Europe and Asia.

Across Europe, the population index more than doubled between 1980 and 2024, increasing by about 107%. The most recent decade was less favourable, with a decline of about 4% in 2015–2024. Local populations also depend on the continued availability of mature woodland, old cavity-bearing trees and productive feeding habitat.