Cavities and burrows
Examples of bird nests located in cavities and burrows.

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Cavities and burrows
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Cyanistes caeruleus (L.) Eurasian Blue Tit
Passeriformes, Paridae
Hollow in an old pear tree, occupied by tits for at least 9 years. Last year, it was occupied by great tit (Parus major).
Polska, Podlaskie, Biebrzański Park Narodowy.
5/21/2016
BE010'07-160521057'JJK
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