How To Tell If A Bird's Nest Is Being Used

If your garden is blessed with trees there is every chance you might also be lucky enough to find birds choosing to make their homes in these.

Build a Bird Nest Scientific American

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Picking up baby birds can do more harm than good

How to monitor bird nests BTO - British Trust for Ornithology

What was this nest? : r/whatsthisbird

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Physics - Explaining the Mechanics of a Bird's Nest