Scientists had long ago proposed that common swifts, a medium-sized migratory bird, might spend most of their lives in flight, but it is only now that it is proved that these birds can actually fly...
Swifts Can Fly Nonstop for 10 Months Straight
Scientists had long ago proposed that common swifts, a medium-sized migratory bird, might spend most of their lives in flight, but it is only now that it is proved that these birds can actually fly...
