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Swallow or Swift?

Gliding vs. flapping is the clue
© Zak Pohlen CC View Large

At a glance, swallows and swifts, both graceful fliers, look much alike. But swifts — like this Chimney Swift — have longer, slimmer wings and short bodies, enabling them to glide for long periods. Their glides are punctuated by rapid, stiff bursts of wing-beats. Swallows, on the other hand, flex and flap their wings. Why do swifts have such a peculiar, stiff wing stroke? Picture a bird wing, with two halves jointed in the middle. Swift wings have a short inner “half” and a long outer half. This causes the stiffness.

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Transcript: 

BirdNote®  

Swallow or Swift?

Written by Bob Sundstrom
 
This is BirdNote.
[Mix of Barn Swallow, http://macaulaylibrary.org/audio/66813, 0.15-.19; Chimney Swift , http://macaulaylibrary.org/audio/223902, ).04-.07; and Tree Swallow vocalizations, http://macaulaylibrary.org/audio/84826, 0.015-.17]
Swirling overhead, dozens of birds swoop and glide in pursuit of insects. Are they swallows . . . or swifts? How in the world do you tell them apart?
At a glance, swallows and swifts look much alike. They’re graceful fliers on long, slender wings and all about the same size. But a closer look reveals key differences: swifts have longer, even slimmer, wings and relatively shorter bodies. Swifts also glide for longer periods. Their glides are punctuated by rapid, stiff bursts of wing-beats — movements so brisk, their wings seem to flicker. Swallows, on the other hand, flex and flap their wings.
Why do swifts have such a peculiar, stiff wing stroke? Picture a typical bird wing, with two halves jointed in the middle. A Swift’s wing reveals an inner “half” that’s extremely short, and an outer portion that’s very long. This causes the stiffness. Try waving your arms with your elbows held against your body, and you’ll get the idea.
Another group of birds shares this distinctive wing structure: hummingbirds.  And swifts are considered to be closely related to hummingbirds. Swallows, on the other hand are songbirds, closer kin of birds like robins and wrens.
For BirdNote, I’m Michael Stein.
                                                                               ###
Bird sounds provided by The Macaulay Library of Natural Sounds at the Cornell Lab of Ornithology, Ithaca, New York. 66813 recorded by William W. H. Gunn, 223902 recorded by Peter Paul Kellogg and Karm Parker, and 84826 recorded by Wilbur L. Hershberger.
BirdNote’s theme music was composed and played by Nancy Rumbel and John Kessler.
Producer: John Kessler
Managing Producer: Jason Saul
Associate Producer: Ellen Blackstone
© 2017 Tune In to Nature.org   July/August 2017   Narrator: Michael Stein

ID#                 swallow-swift-01-2017-08-17    swallow-swift-01

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