Willow Tit
Parus montanus
ringed in September 1999 at Fårön, Piteå, Sweden
62.20 N, 21.31 E

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Vargviken, Fårön, Piteå 17 November 2003

Other birds of the same species has been observed with
the upper mandible up to 1,5 mm shorter than the lower.
The same phenomena is observed in Great Tit, Parus major,
Coal Tit, Parus ater but never in Blue Tit, Parus caeruleus.
Only one bird (Willow Tit) with this abrasion has been
recaptured after a following summer!

Willow Tit with grey-coloured middle rectricies.	Willow Tit with white crown feathers.
Both birds later recaptured with "normal colouration".

© Peter Nilsson 1999

peter@medit.se