A structure or shelter for birds that resembles a bottle in shape, or a nesting place inside a bottle-shaped natural formation.
Compound from 'bottle' and 'nest,' describing bottle-shaped nesting structures. This term is primarily ornithological, describing where certain bird species naturally shelter.
Some birds have evolved to nest in bottle-shaped holes in trees because the narrow entrance prevents larger predators from entering while the wider chamber provides safety—it's architecture that evolution designed long before humans invented bottles.
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