Mystery Bird: Black-capped Chickadee, Poecile atricapilla

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[Mystery bird] Black-capped Chickadee, Poecile atricapilla, photographed near a small Olympic Peninsula lake in Shelton, Washington State. [I will identify this bird for you in 48 hours]

Image: Lee Rentz, 19 February 2009.

As an added bonus, can you name the close relatives to today's mystery bird that are found in Finland?

Please name at least one field mark that supports your identification.

The closest relatives to the pictured bird that live in Finland are [English name, Finnish name, Scientific name];

Willow Tit, Hömötiainen, Poecile montanus
Marsh Tit, Viitatiainen, Poecile palustris
Siberian (Grey-headed) Tit, Lapintiainen, Poecile cinctus

more distant relatives include;

Great Tit, Talitiainen, Parus major
Azure Tit, Valkopäätiainen, Parus cyanus
Coal Tit, Kuusitiainen, Periparus ater
Eurasian Blue Tit, Sinitiainen, Cyanistes caeruleus
Crested Tit, Töyhtötiainen, Lophophanes cristatus
Long-tailed Tit, Pyrstötiainen, Aegithalos caudatus

Review all mystery birds to date.

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Almost automatically said chestnut-backed, but I think it's a black-capped chickadee. Buff sides, not brown and, black, rather than dark brown cap.

I assume the Finish relative you refer to is the Willow Tit, which is awfully similar looking. (Also like the Marsh Tit, but I don't think that's found in Finland.)

I agree, it's a black-capped chickadee. That black cap and bib are diagnostic for the black-capped chickadee, and the buff sides immediately exclude the chestnut-backed chickadee.

As for a close Finnish relative, the willow tit, marsh tit, and Siberian tit would qualify.