All About Birds↗ | Audubon↗ | eBird↗
"Like other swallows, these birds forage in large groups in open areas" according to the Wingspan card
San Francisco D5600 + 70-300mm F4.5-6.3 @ 300mm, ISO 125, 1/1000, F6.3(4MP crop, equiv 1129mm F22)
Berkeley, CA R5m2 + 100-400mm F5.6-8 @ 400mm, ISO 320, 1/1000, F8(3MP crop, equiv 1534mm F32)