There is a swallow’s nest outside right now with like 6 babies in it that barely fit and no room in sight for the parents. Do the parents sleep there too somehow or somewhere else?
A few years ago I saw the same with a robin’s nest and in that case, when the babies got bigger but before they could fully fly, they all moved into a nearby shrub but could only glide and hop.
Was that unusual or common to have a nest too small to hold the whole breed and parents?
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A larger nest is more effort to build. Birds will build what they need – big enough for the babies until they can either fly or at least have a good survival chance elsewhere. Some birds don’t build nests at all.
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