How do they do it?

Photo by N. Camilleri / Lund University / PA

Researchers in Europe have stated that observations of Common Swifts during winter months are scarce and that roosting sites have never been found in sub-Saharan Africa. Now, swifts have been equipped with accelerometers and results show that swifts never seem to stop flying, with birds airborne for 99% of the time during their 10-month non-breeding period.

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BarrytheBirder