The Common Swift spends it's entire life in the air, only coming down to nest.

The Common Swift spends it's entire life in the air, only coming down to nest.
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Except when nesting, swifts spend their lives in the air, living on the insects caught in flight; they drink, feed, and often mate and sleep on the wing.[3] No other bird spends as much of its life in flight. Feeding parties can be very large in insect-rich areas, such as wetlands. Reports of as many as 2000 swifts feeding over flooded gravel pits, lakes and marshy river deltas are not uncommon, and may represent an ingress of swifts from within as much as a 100 kilometer radius; swifts nesting in Western Scotland are thought to venture to Lough Neagh in Northern Ireland to feed on the abundant and nutritious "Lough Neagh Fly". @Curionic

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