Animal
Eurasian blue tit
The blue tit is a tiny bird with a blue cap and a yellow tummy. It loves to eat caterpillars and can hang upside down on branches.
The Eurasian blue tit is a small, colorful songbird of woods, parks and gardens across Europe and western Asia. It hangs upside down to find caterpillars, nests in holes and nest boxes, and can lay a very large clutch of eggs once a year, timed for when caterpillars are plentiful.
Cyanistes caeruleus is a small tit (family Paridae) resident from Ireland and Iberia to Russia, Iran and Kazakhstan. It weighs about 11 grams, raises a single large brood timed to the spring peak of caterpillars, sees ultraviolet light, and is listed as Least Concern with a stable population of tens of millions.
Photo: © Giles Laurent, gileslaurent.com, License CC BY-SA, CC BY-SA 4.0, via Wikimedia Commons
Meet the Eurasian blue tit
This is the blue tit.
It is a tiny bird with a blue cap, a white face and a yellow tummy. A black stripe runs across each eye. It visits many gardens.
The RSPB calls the blue tit one of the most attractive and recognizable garden visitors in Britain. It has a bright blue cap, a white face with a black stripe through each eye, a yellow chest, and wings of blue, green and white.
It is tiny: about 12 centimeters long and only about 11 grams. Blue tits are busy, bold birds that visit garden bird feeders, use nest boxes and can hang upside down from twigs like little acrobats.
Cyanistes caeruleus is a member of the tit family, Paridae. Adults are about 12 centimeters long with an 18-centimeter wingspan, and the BTO's average weight for UK birds is 10.9 grams. The sexes look similar, though on average males are slightly brighter.
The pattern is distinctive: a blue cap, white face crossed by a dark eye stripe, yellow underparts, and blue, green and white wings. In Britain no other tit has blue feathers, and the similar great tit is much larger with an all-black cap. Blue tits are common in woodland, hedgerows, parks and gardens, and regularly use bird feeders and nest boxes.
Quick facts
- Group
- Bird
- Length
- 0.12 m
- Wingspan
- 0.18 m
- Weight
- 0.01 kg
- Lifespan in the wild
- 3 years
Where it lives
Blue tits live in Europe and parts of Asia.
They live in woods, parks and gardens. They stay in the same place all year.
Eurasian blue tits live across almost all of Europe, from Ireland, Spain and Portugal to Scandinavia and Russia, and east into Türkiye, Iran and Kazakhstan. They live in woodland, hedges, parks and gardens, especially woods of broad-leaved and mixed trees.
Blue tits do not migrate. They stay in the same area all year round, and in winter they team up with other kinds of tits in mixed flocks to search for food.
The IUCN's 2024 global assessment lists the species as resident in about fifty countries across Europe and western Asia, from Ireland and Portugal to Russia, Iran and Kazakhstan, at elevations up to 3,500 meters. It is not a migrant.
Habitats listed by the IUCN include forest, shrubland and land shaped by people. In Britain the Woodland Trust describes it as a bird of deciduous and mixed woodland, hedges, gardens and parks, and the BTO notes it is absent only from the Northern Isles and parts of the Hebrides.
Continents
Its habitat
Where can you find this animal?
- Lives here naturally · Countries and seas named by a scientific source
- Sightings recorded · Records of wild sightings (GBIF)
Lives here naturally · Countries and seas named by a scientific source
Woodland, hedgerows, parks and gardens across Europe and western Asia, east to Russia, Iran and Kazakhstan, from sea level to about 3,500 meters. Resident all year.
Places: Albania, Armenia, Austria, Azerbaijan, Belarus, Belgium, Bosnia & Herz., Croatia and 39 more places.
Source: iucn-red-list · checked October 2026
Sightings recorded · Records of wild sightings (GBIF)
Counts of GBIF records of wild observations (human and machine) and preserved specimens. Records include introduced populations, vagrants, escaped or released animals and misidentifications, so a country with records is not necessarily part of the native range.
Wild sightings have been recorded in Sweden, France, UK, Finland, Netherlands, Germany, Norway, Spain and 52 more places.
Source: gbif · checked October 2026
Range maps show where scientists say an animal lives, often country by country. An animal may live in only part of a country shown, and sightings records can include animals that wandered far from home.
What it eats
Blue tits love caterpillars!
They also eat bugs, spiders, fruit and seeds. They can hang upside down to find food under leaves.
Caterpillars are a blue tit's favorite food. Blue tits also eat other insects, spiders, fruit and seeds. They are amazing acrobats and often hang upside down from branches to reach food hiding under leaves and twigs.
In gardens they visit feeders for seeds, peanuts and fat balls. They are such regular visitors that the RSPB says a garden with four or five blue tits at a feeder at once may really be feeding 20 or more, coming and going.
The diet is mainly invertebrates, with caterpillars the most important, plus other insects, spiders, fruit and seeds. Foraging is acrobatic: blue tits often hang upside down from branches to reach food.
Their short, thin black bill suits nibbling small items and nuts. In winter they join mixed-species flocks to search for food, and garden feeders matter most then, when food is scarce. Their boldness is famous: in Britain, in the days of doorstep milk deliveries, they had a reputation for stealing the cream from the top of the milk.
Did you know?
Blue tits once drank cream from milk bottles!
In Britain, when milk was delivered to doorsteps, blue tits became famous for stealing the cream from the top.
When milk was delivered to doorsteps in Britain, blue tits gained a reputation for stealing the creamy top.
An amazing body
Blue tits have a tiny, short beak.
It is just right for little bugs and seeds. Blue tits can see colors that people cannot see!
A blue tit's bill is very short and thin, just right for picking caterpillars off leaves and nibbling nuts. Its little feet grip twigs, and it often hangs upside down to feed.
Blue tits can see ultraviolet light, a kind of light that people cannot see. Under ultraviolet light, the blue on the front of a blue tit's head glows brightly, and scientists think this helps females choose a partner.
The bill is short, fine and black, suited to gleaning small invertebrates and nibbling seeds and nuts. It often feeds hanging upside down from branches.
Like all birds, blue tits can see ultraviolet light. Under ultraviolet light the front of the head glows brightly, and according to the Woodland Trust this is thought to be how females choose their partners. On average males are slightly brighter than females, and the BTO's measurements show males have slightly longer wings (about 65 millimeters against 62).
Growing up
Blue tits make a soft nest in a hole.
The nest is made of moss, hair and feathers. The mother lays lots of tiny eggs. Mom and dad feed the chicks lots of caterpillars.
Blue tits start looking for a nest hole as early as January: a crack in a tree, an old woodpecker hole, a gap in a wall or a nest box. The female builds a soft nest of moss, hair, leaves, feathers and spider webs.
In late April or early May she lays a big clutch, usually 8 to 10 eggs, and she keeps them warm for about two weeks while the male brings her food. The chicks leave the nest after about three weeks. Blue tits usually raise just one brood a year, timed so the chicks hatch when caterpillars are everywhere.
Nest sites are cavities: rot holes and cracks in trees, old woodpecker holes, crevices in walls and nest boxes. The female builds the nest of moss, hair, leaves, feathers and spider webs with little help from the male. In the UK the average first clutch is laid around 26 April.
Clutches are large, typically 8 to 10 eggs, and up to 16 have been recorded. Incubation, by the female alone, begins once the clutch is complete and lasts about 13 to 14 days, while the male brings her food. Chicks fledge at 18 to 21 days. Most pairs raise one brood a year, synchronized with the emergence of caterpillars. Birds breed at one year old; the BTO gives a typical life expectancy of three years.
Flocks, songs and scolding
Blue tits sing "tsee tsee tsee."
In winter they fly around in groups with other little birds. If you get too close, they make an angry, buzzy sound.
Blue tits are lively, chatty birds. Their song is a bright "tsee-tsee-tsee", often ending in a lower rattle. In spring they sing to defend their territory and attract a mate.
In winter, family groups join up with other kinds of tits to form flocks that move through the woods together, keeping in touch with little contact calls. If you get too close, a blue tit may scold you with an angry, churring alarm call.
Blue tits are vocal all year. In spring and summer song serves to defend territories and attract mates; it is typically a couple of high "tsee" notes followed by a lower trill or rattle. A harsh churring is used as an alarm call.
Outside the breeding season family parties merge with other tit species into mixed feeding flocks that keep together with contact calls. Blue tits are bold at feeders, often clinging on after other birds have flown, and they chase one another around gardens. Natural predators named by the Woodland Trust include sparrowhawks, weasels and owls.
Did you know?
A blue tit can lay a lot of eggs at once.
Blue tits usually lay 8 to 10 eggs, and nests with as many as 16 have been found.
Typical clutches are 8 to 10 eggs, with an observed range of 2 to 16, unusually large for a bird of 11 grams.
Helping blue tits
There are lots and lots of blue tits.
People help them with bird feeders in winter and nest boxes in spring.
Blue tits are doing well. The IUCN lists them as Least Concern, and their numbers are stable. In the United Kingdom they are one of the most common birds, and the Woodland Trust reports that their population has grown by 21 percent since 1970.
You can help blue tits by putting up a nest box in late winter and by keeping a bird feeder filled, especially in winter when food is hard to find.
The IUCN assessed the Eurasian blue tit as Least Concern in May 2024, with a stable global population of about 62.8 to 100 million mature individuals. In the UK it is Green-listed, the lowest level of conservation concern; the BTO reports a 20 percent increase in the UK breeding population from 1967 to 2024, though with a shallow decline over the last ten years, and the Woodland Trust gives 21 percent since 1970.
Breeding is synchronized with the emergence of caterpillars, and the Woodland Trust stresses how important it is for blue tits to time their nesting just right. Nest boxes and winter feeding in gardens give blue tits extra places to breed and food when insects are scarce.
IUCN Red List
How is the eurasian blue tit doing in the wild?
- Least Concern (this animal)
- Near Threatened
- Vulnerable
- Endangered
- Critically Endangered
- Extinct in the Wild
- Extinct
Least Concern
Not at risk of disappearing from the wild right now.
See the IUCN Red List assessment · The IUCN Red List of Threatened Species 2021.3
Amazing facts
-
Blue tits can see colors that we cannot see.
Blue tits see ultraviolet light. Under it, the front of a blue tit's head glows brightly.
Like all birds, blue tits see ultraviolet; the front of the head glows brightly under it, and this is thought to guide females' choice of mates.
-
A blue tit can lay a lot of eggs at once.
Blue tits usually lay 8 to 10 eggs, and nests with as many as 16 have been found.
Typical clutches are 8 to 10 eggs, with an observed range of 2 to 16, unusually large for a bird of 11 grams.
-
Blue tits once drank cream from milk bottles!
In Britain, when milk was delivered to doorsteps, blue tits became famous for stealing the cream from the top.
When milk was delivered to doorsteps in Britain, blue tits gained a reputation for stealing the creamy top.
-
Blue tits are tiny acrobats.
Blue tits often hang upside down from branches to reach food under leaves.
Acrobatic foraging is typical: blue tits often hang upside down from branches to reach food.
Words to know
- clutch
- a group of eggs laid at one time
- cavity
- a hollow space, such as a hole in a tree or a wall
- ultraviolet
- a kind of light that birds can see but people cannot
- fledge
- to leave the nest when ready to fly
- resident
- staying in the same area all year instead of migrating
- mixed flock
- a group of birds of different kinds that feed together
Discovery challenge
-
What is a blue tit's favorite food?
Which food is a blue tit's favorite?
Which food is most important to blue tits and their chicks?
- Caterpillars
- Fish
- Grass
Show the answer
Caterpillars
Blue tits love caterpillars, and they feed them to their chicks.
Caterpillars are their favorite, and they also eat insects, spiders, fruit and seeds.
Caterpillars; breeding is timed so chicks hatch during the spring caterpillar peak.
-
Where do blue tits make their nest?
Where does a blue tit build its nest?
What kind of nest site does the blue tit use?
- On open sand
- On top of a tall reed
- In a hole, like a tree hole or nest box
Show the answer
In a hole, like a tree hole or nest box
They nest in a hole, like a hole in a tree or a nest box.
They use holes in trees, gaps in walls, old woodpecker holes and nest boxes.
It is a cavity-nester: rot holes, cracks, old woodpecker holes, wall crevices and nest boxes.
-
What can blue tits see that people cannot?
What kind of light can blue tits see that people cannot?
Which part of the light spectrum do blue tits see beyond human vision?
- Ultraviolet light
- Radio waves
- X-rays
Show the answer
Ultraviolet light
They can see ultraviolet light. We cannot!
Blue tits see ultraviolet light, and their blue caps glow brightly in it.
Ultraviolet; the front of the head glows under UV, which is thought to matter in mate choice.
-
How do blue tits find food under leaves?
What trick helps blue tits reach food under leaves and twigs?
Which foraging behavior is typical of blue tits?
- They dig in the ground
- They hang upside down
- They dive into water
Show the answer
They hang upside down
They hang upside down, like little acrobats!
Blue tits often hang upside down from branches to reach food.
Acrobatic gleaning, often hanging beneath twigs, lets them reach food under leaves and buds.
Places where you might see it
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Watch
Country
United Kingdom
The United Kingdom, or UK, lies on islands off the northwest coast of Europe. It is made up of four parts, England, Scotland, Wales and Northern Ireland, and about 69.5 million people live there. Its capital is London.
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Country
Germany
Germany is a country in north-central Europe. The land rises from flat plains by the North Sea and the Baltic Sea to forested hills and, in the far south, the Alps. About 83.5 million people (2025) live there, and its capital is Berlin.
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United Kingdom
The United Kingdom, or UK, lies on islands off the northwest coast of Europe. It is made up of four parts, England, Scotland, Wales and Northern Ireland, and about 69.5 million people live there. Its capital is London.
-
Watch
Country
Germany
Germany is a country in north-central Europe. The land rises from flat plains by the North Sea and the Baltic Sea to forested hills and, in the far south, the Alps. About 83.5 million people (2025) live there, and its capital is Berlin.
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For parents & teachers
What children will learn
- Identify a blue tit by its blue cap, eye stripe and yellow chest.
- Explain why blue tits time their nesting to the spring caterpillar peak.
- Describe how blue tits nest in cavities and raise one large brood a year.
- Name simple ways people help garden birds, such as nest boxes and winter feeders.
Recommended ages: 3 to 17 · About 12 minutes
Talk about it
- Why might it matter for blue tit chicks to hatch at the same time as lots of caterpillars?
- Why do you think blue tits join other birds in flocks in winter?
- What would make a good place for a nest box near your home or school?
Try at home or in class
- Count garden birds for ten minutes and draw the colors of any blue tits you see: blue cap, black eye stripe, yellow chest.
- Weigh out 11 grams on a kitchen scale, using paper clips or dry beans, to feel how light a blue tit is.
Key vocabulary: clutch, cavity, ultraviolet, fledge, resident, mixed flock
Where these facts come from
- The IUCN Red List of Threatened Species , International Union for Conservation of Nature (IUCN terms of use (no redistribution of Red List data or range maps))
- GBIF Backbone Taxonomy and GBIF Occurrence Search , Global Biodiversity Information Facility (CC0 1.0 (backbone); occurrence counts are facts derived from records under CC0, CC BY and CC BY-NC)
- Cyanistes caeruleus (Eurasian Blue Tit), global Red List assessment 2024 , IUCN Red List of Threatened Species
- Blue Tit , RSPB
- Blue Tit BirdFacts , British Trust for Ornithology (BTO)
- Blue tit (Cyanistes caeruleus) , Woodland Trust
- Wikidata , Wikimedia Foundation (CC0 1.0)
- Wikimedia Commons , Wikimedia Foundation (Per file: Public domain, CC0, CC BY or CC BY-SA only (credited on each page))
Checked, not yet human-reviewed. Last updated October 27, 2026. Spotted a mistake? Tell us.