Marsh Tit

Marsh tit or willow tit?

The marsh tit’s most notable challenge for birdwatchers is its near-identical appearance to the willow tit — same size, same glossy-black cap, same brown back, same pale underparts. The call is the most reliable distinction: the marsh tit’s explosive “pitchoo” is quite unlike the willow tit’s nasal “eee-zee-zee.” Small differences in plumage help: the marsh tit has a glossier, neater black cap, no pale wing panel, and a cleaner white face. Despite the name, the marsh tit is rarely found in marshes — it prefers dry deciduous woodland, while the willow tit favours damp scrub and birch carr.

Food hoarding

Marsh tits are compulsive food hoarders. Through autumn and early winter, they carry seeds — particularly hazel, sunflower, and beech — one at a time to hiding places in bark crevices, leaf litter, and moss. Each bird may hide thousands of individual items in a season. Unlike many hoarders, marsh tits can relocate the vast majority of their stores, using a sophisticated spatial memory based on landmarks. Research has shown their hippocampus (the brain region associated with spatial memory) is proportionally larger than in non-hoarding species.

Ancient woodland indicator

In Britain, the marsh tit is a useful indicator of ancient broadleaved woodland. It requires large areas of mature deciduous forest with structural complexity — multiple age classes of trees, abundant dead wood, and diverse shrub layers. It is sedentary and rarely moves far from its natal woodland. The loss and fragmentation of ancient woodland in Britain has driven population declines of over 50% since the 1970s.

Breeding

Marsh tits nest in existing cavities — tree holes, old woodpecker holes, or occasionally nest boxes with small entrance holes. The female builds a nest of moss, hair, and plant down. Clutches of five to nine eggs are incubated for 13–14 days. Both parents feed the young, which fledge after about 17 days.