Great Tit

The great tit (Parus major) is the largest and one of the most familiar tits across much of Europe. Adults are about 15 cm long and usually weigh around 15–22 g. The head is glossy black with large white cheeks, the back is greenish, and the underparts are bright yellow with a black stripe down the centre. The stripe is usually broader in males, extending into a larger black patch on the lower belly.

Coal tit (Periparus ater) is smaller, has a conspicuous white nape patch and pale wing bars, and lacks the great tit’s yellow underparts and broad central belly stripe. The species has an unusually large repertoire of songs and calls. Individual males can use several song types, so great tits may sound surprisingly different from one encounter to the next.

The wider great tit complex has been treated differently over time. Current AviList taxonomy recognises two species: the western Parus major and the Asian Parus cinereus. The former Japanese tit Parus minor is now included within P. cinereus.

Great tits are most abundant in deciduous and mixed woodland but also thrive in forest edges, parks, gardens, orchards and towns wherever trees and nesting cavities are available. Mature trees provide feeding surfaces and natural holes, while shrubs and lower vegetation add further foraging opportunities and cover.

The species adapts especially well to human-dominated wooded landscapes. Nest boxes can replace some natural cavities, and supplementary feeding can provide an important winter resource, although neither substitutes for the broader habitat structure and natural food supply used through the rest of the year.

In spring and summer the diet is dominated by insects, spiders and other invertebrates. Caterpillars are particularly important while chicks are growing. During autumn and winter the birds shift strongly toward seeds, nuts, fruit and other plant foods and readily use garden feeders.

Great tits are flexible opportunists and occasionally exploit very unusual prey. A study published in 2010 at a cave in north-eastern Hungary documented great tits actively locating, killing and eating hibernating common pipistrelles (Pipistrellus pipistrellus). This is a highly local and exceptional feeding behaviour rather than a normal part of the diet, but it shows how readily the species can take advantage of an unusual food source under difficult winter conditions.

Breeding birds are territorial, but outside the breeding season great tits become more social and frequently join flocks with other tits and small woodland birds. In such mixed-species flocks, both feeding efficiency and competition can change with flock composition, linking winter social organisation closely to how birds find and exploit patchy food.

Great tits also adjust their behaviour strongly to season and weather. Winter birds search across a wider variety of feeding sites, use sheltered cavities such as nest boxes for night roosting and may move closer to gardens and settlements where food is more predictable.

Communication is equally flexible. The large vocal repertoire is used in territory defence, contact and alarm, and young birds learn aspects of their songs and calls from other individuals. This combination of vocal, social and foraging flexibility is a central part of the species’ everyday behaviour.

An experiment published in 2015 in Wytham Woods in England showed how readily great tits can learn from one another and turn a new solution into a local behavioural tradition. Two alternative ways of opening food containers spread socially through wild populations. Around three quarters of the birds adopted one of the techniques, each population tended to settle on its own locally common method, and the traditions persisted across two generations.

Birds preferentially copied the locally common method even after encountering alternatives. Social learning, network connections and conformity can therefore stabilise a learned behaviour across a wild population rather than every individual repeatedly solving the same problem independently.

Great tits are resident across much of western and central Europe, but movement varies with age and region. Young birds disperse more widely than established adults, and northern or eastern populations can show stronger autumn movements in some years.

These movements are much shorter and less regular than the long-distance migration of many songbirds. Adults often remain close to familiar breeding areas throughout the year, while local winter numbers can still change as young birds disperse and flocks redistribute themselves according to food and weather.

Great tits are cavity nesters but do not normally excavate their own holes. Natural tree cavities, nest boxes and suitable recesses in buildings and other structures are readily used. The female builds the nest, typically using moss as a base and lining the cup with hair, wool and feathers.

A typical clutch contains 7–9 eggs. The female incubates alone for about 13–14 days while the male supplies food, and both parents feed the chicks after hatching. The young normally remain in the nest for about 18–21 days. One brood is usual, with a second occurring occasionally.

Breeding dates have advanced as springs have become earlier. In Britain, laying dates have shifted about nine days earlier since 1968. Great tits can adjust laying time to temperature and food conditions, but the seasonal peak in caterpillar abundance can shift faster than breeding dates in some years, creating a possible mismatch between the chicks’ greatest food demand and the richest food period.

The great tit is classified as least concern on the IUCN Red List. It has an enormous range, occupies many natural and human-modified habitats and remains one of the most abundant woodland birds across much of Europe.

Regional trends vary, but the species is not currently considered globally threatened. Its broad diet, behavioural flexibility and ability to use both natural cavities and nest boxes help it persist in a wide range of wooded landscapes.