It is known that Tree Sparrows (Passer montanus) in Central Europe are expanding their territories to the urban areas. But I didn't know that they breed in artificial cavities. Yesterday I had this view from my flat in Karlová Ves, Bratislava. Pair of Tree Sparrows appeared that they are looking for appropriate nesting cavity.
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| Tree Sparrow is checking the cavity |
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| another Tree Sparrow waiting for its partner |
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| cavities are below the roof, usually used by Common Swifts |
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