Blue tit at feeder

Today, great tits and blue tits at the feeder on the street side of the apartment.

Many of them probably fledglings; the blue tit on the photo is still a dim kind of yellow.

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• Great tits of Vlieland island (dearkitty1.wordpress.com)
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• Breeding performance of blue tits in relation to lead pollution and nest failure rates in Algeria (northafricanbirds.wordpress.com)
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• Ornithologists baffled by pair of Great Tits taking up residence in Downing St (tompride.wordpress.com)
• Low Cross-Sex Genetic Correlation in Carotenoid-Based Plumage Traits in the Blue Tit Nestlings (Cyanistes caeruleus) (plosone.org)