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
Feeding the chicks parents remove the droppings from the hollow.
Polska, Podlaskie, Biebrzański Park Narodowy.
5/22/2016
BE010'08-160522046'JJK
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