Marsh Tit

Poecile palustris

The marsh tit is a Eurasian passerine bird in the tit family Paridae and genus Poecile, closely related to the willow tit, Père David's and Songar tits. It is a small bird, around 12 cm (4.7 in) long and weighing 12 g (0.42 oz), with a black crown and nape, pale cheeks, brown back and greyish-brown wings and tail. Between 8 and 11 subspecies are recognised. Its close resemblance to the willow tit can cause identification problems, especially in the United Kingdom where the local subspecies of the two are very similar; they were not recognised as separate species until 1897. Source

Where it is now

In the last 8 weeks this bird was recorded 709,672 times across 42 areas (each area is a 5 degree square).

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Movement and weather

Each season it is first heard regularly where daytime highs are around 25°C (typically 22 to 28°C, from 19 areas). That holds across 25° of latitude, which suggests its timing follows temperature more than the calendar.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.