Identification of Swallows in Flight (North America)
Top row, left to right: Barn Swallow, Tree Swallow, Purple Martin (adult male).
Bottom row, left to right: Bank Swallow, Cliff Swallow, Northern Rough-winged Swallow, Purple Martin (female/young male).
Swallows spend much of their time in the air, catching insects. This makes for an impressive spectacle but also creates an identification challenge that puts off many birders. People may be quick to give up on identifying swallows in flight, or any birds in flight for that matter, because they are missing a key piece to the puzzle: it is more important to look for the small number of field marks that are most obvious than it is to look for a lot of details that you won’t be able to see–knowing the difference between the two is the trick. For example, with flying swallows, it is usually more important to look for areas of strong contrast than it is to look for detailed color patterns, as you might on say, a ground-feeding sparrow. That is why you will see the words “dark” and “pale” more often here than mention of specific colors; you simply don’t have time to discern such details when a bird is zipping by in a fraction of a second...
Read more:
https://chicagobirdalliance.org/blog/2023/6/22/identifying-adult-swallows-in-flight
