Willow Tit (Poecile montanus)

Willow Tit (Poecile montanus)

Quick Facts

  • Scientific Name: Poecile montanus
  • Family: Paridae (Tits)
  • Size: 11.5–12 cm (4.5–5 inches)
  • Wingspan: 17–21 cm (6.7–8.3 inches)
  • Weight: 9–14 g (0.3–0.5 oz)

Conservation Status

  • IUCN Status: Least Concern (global)
  • UK Status: ⚠️ Red List — the UK’s fastest declining resident bird
  • Population Trend: Catastrophic decline — UK population has fallen by around 94% since 1970, from approximately 23,000 breeding pairs to just 3,400

Worldwide Distribution

The Willow Tit is widespread across the Palearctic but in rapid retreat in Britain:

  • Resident across much of Europe, from Scandinavia south to the Alps, and east through Russia and Siberia to the Pacific coast
  • In the UK, now largely confined to northern and central England, with strongholds in the north-west — parts of south-east England have lost the species entirely
  • Highly sedentary — individuals rarely move more than a few kilometres from their birth site, making recolonisation of lost areas almost impossible without intervention
  • Non-migratory; a year-round resident wherever it survives

Spotting Difficulty Rating

🔍🔍🔍🔍🔍 (5/5 — Very Difficult)

  • Britain’s rarest common-looking bird — easily confused with the Marsh Tit, which is similarly plain and similar in size
  • Restricted to a specific and rapidly shrinking habitat — you must travel to the right wet woodland or scrub to find it
  • Small, quiet, and retiring — often detected by call before it is seen
  • With only around 3,400 breeding pairs remaining, simply finding one at all requires planning and patience

Habitat and Behaviour

The Willow Tit is small, quiet, and easy to overlook — which makes the scale of its disappearance from the British landscape all the more alarming. It closely resembles its relative the Marsh Tit: both are compact birds with a black cap, white cheeks, and plain brown upperparts. The key differences are subtle — the Willow Tit has a slightly larger, more bull-necked head, a dull rather than glossy cap, a faint pale panel on the closed wing, and a larger, more untidy bib. The call is the most reliable distinction: a thin, buzzing, nasal “eez-eez-eez” quite unlike the Marsh Tit’s sneezing “pitchu.”

What makes the Willow Tit genuinely extraordinary is its habitat and nesting behaviour. It is a bird of wet scrub and young damp woodland — a dense, tangled, unglamorous habitat of alder, birch, willow, and elder growing in and around wetlands, bogs, and old industrial land. Conservation writer Ben Macdonald described this habitat precisely: “Wet scrub is instantly recognisable — a dense ground layer of damp-dependent species: Alder, Elder, Birch, Willow, Buckthorn, Hawthorn and Bramble. Wet scrub defies categorisation — it is entirely its own habitat. And it is to Willow Tits what a reedbed is to a Bittern — a necessity.”

Uniquely among British tits, the Willow Tit excavates its own nest cavity each year, chiselling out a hollow in the soft, rotting wood of a standing dead tree or stump using its small bill — a remarkable feat of engineering for a bird weighing barely twelve grams. The pair will spend up to three weeks on the excavation, and because they create a fresh cavity annually, old nest holes become available to a succession of other species. The insistence on fresh deadwood is both the Willow Tit’s defining trait and its vulnerability: take away the rotting wood, and the bird has nowhere to breed.

Outside the breeding season, Willow Tits may join mixed tit flocks moving through woodland, but they remain highly territorial and sedentary — rarely venturing far from known habitat. Their diet includes insects, spiders, seeds, and berries, and unlike some tits they will cache food for later retrieval, storing individual items in bark crevices and leaf litter.

Cultural History

It was only in 1897 that British ornithologists, examining specimens in the Natural History Museum, recognised that what had always been assumed to be Marsh Tits included two distinct species that had been quietly coexisting, undetected, in the British countryside. The Willow Tit had been there all along — breeding in its wet scrub, excavating its nest holes, raising its young — and no one had noticed. It was formally described as new to British science the following year.

This late discovery reflects something real about the bird: it occupies a habitat that has never attracted much human attention or affection. Wet scrub — the tangled, waterlogged, thorny, apparently chaotic fringe land between open water and mature woodland — has historically been regarded as wasteland, neither productive farmland nor beautiful forest. It has been drained, cleared, tidied, and built over without ceremony for centuries, and the creatures that depended on it have been lost along with it, often without anyone noticing they were gone.

There is a particular irony in one of the suspected causes of the Willow Tit’s decline. The dramatic rise of garden bird feeding in Britain — now a national pastime involving millions of households — has been a conservation success story for many species, boosting populations of Blue Tits, Great Tits, and Great Spotted Woodpeckers. But these are precisely the species that compete with and predate upon the Willow Tit: Blue Tits aggressively occupy the nest holes Willow Tits excavate, and Great Spotted Woodpeckers, whose numbers have increased by over 300% since the 1970s, are major nest predators. The bird feeders in suburban gardens may have inadvertently helped tip the balance against one of Britain’s most vulnerable birds.

The good news — and in the spirit of planting seeds of hope, it is worth emphasising — is that targeted conservation is beginning to make a difference. WWT is running an active captive breeding and release programme, trialling predator-proof nest boxes, and working to create and link new areas of wet scrub habitat. Yorkshire Wildlife Trust and the RSPB’s Back from the Brink project has generated vital data from the Dearne Valley. Beavers, whose wetland engineering naturally creates the wet scrubby woodland the Willow Tit needs, may yet prove to be unexpected allies in its recovery.

Fun Facts

  • 🪚 The only British tit that excavates its own nest hole — chiselling a fresh cavity each year in soft, rotting wood using nothing but its bill
  • 🔬 Not recognised as a distinct British species until 1897 — it had been overlooked and misidentified as a Marsh Tit for the entire history of British ornithology
  • 🦏 Now rarer in the UK than the southern white rhinoceros — with only around 3,400 breeding pairs remaining
  • 🗺️ So sedentary that isolated populations cannot recolonise lost habitat on their own — making habitat connectivity and translocation essential conservation tools

Best Places to Spot a Willow Tit in the UK

  1. RSPB Old Moor, Dearne Valley, South Yorkshire
  2. WWT Washington Wetland Centre, Tyne and Wear
  3. Risley Moss Nature Reserve, Warrington
  4. Tame Valley Wetlands, West Midlands
  5. Wet woodland and alder carr edges throughout the north-west of England — the species’ remaining stronghold

Recommended Viewing Tips

  • Learn the call first — a thin, buzzing, nasal “eez-eez-eez” is the most reliable way to distinguish from Marsh Tit in the field
  • Search in wet scrub, alder carr, and young damp woodland — not mature oak or beech woodland, where Marsh Tits are more likely
  • Look for the slightly larger head, dull (not glossy) black cap, and pale wing panel to separate from Marsh Tit visually
  • In late winter and early spring, watch for pairs inspecting standing dead stumps and rotting wood for potential nest sites
  • Visit dedicated reserves where conservation management actively maintains suitable habitat — sightings elsewhere are increasingly rare
  • Patience is essential; despite their small size, Willow Tits can be frustratingly unobtrusive even in known territories

Conservation Notes

The Willow Tit is Britain’s fastest declining resident bird, and its situation is urgent. The primary driver of decline is the loss of wet scrub and young damp woodland — a habitat that has been systematically removed, drained, or allowed to mature beyond the early successional stage the bird requires. Competition for nest sites from Blue Tits, and predation of nests by Great Spotted Woodpeckers (whose numbers have grown), compound the pressure. The species’ extreme sedentariness means it cannot recover ground naturally once lost from an area.

Willow Tits need:

  • Active creation and management of wet scrub and young damp woodland — coppicing, scrub management, and maintenance of early successional habitats
  • Retention of standing deadwood and soft-wooded stumps in wet woodland for nest excavation
  • Habitat connectivity — linking isolated patches of suitable scrub so that young birds can disperse between them
  • Predator-proof nest boxes, currently being trialled by WWT, to protect against Great Spotted Woodpecker predation
  • Captive breeding and translocation programmes to reintroduce the species to areas where it has been lost, supported by restored habitat
  • Recognition that “scrubby wasteland” is not wasteland at all — it is some of the most valuable and threatened wildlife habitat in Britain