Tree Swallows and Feathers

BirdNote^®

Tree Swallows and Feathers – An Aerial Ballet

Written by Bob Sundstrom

This is BirdNote!

[Tree Swallows’ gurgling calls]

Tree Swallows glisten in the June sunlight, as they swoop and glide, their arcs interlacing in the air. Agile, elegant masters of flight, the swallows gather near their nestboxes, clustered on posts at the edge of a marsh. [Gurgling calls (interspersed through the rest of the script)]

A white feather flutters down among them. One swallow snatches the feather in its bill and flies upward, as another swallow gives chase. After a moment, the lead bird lets loose the feather, which drifts lazily, until the second bird swoops in to catch it in midair. The aerial ballet of swallows and feather swirls on for minutes, as other swallows join in the feather chase.

Are the swallows just playing or are they competing for these feathers? Loose feathers are an important resource for Tree Swallows. They line their nests thickly with them, a featherbed for nestlings.  Continuing research suggests that, as Tree Swallows build their nests, it is the females who collect the feathers. Their aerial dance may well be a competition for nest-lining material.

And the males in the feather chase? Maybe they’re just playing along. [Tree Swallows’ gurgling calls]

For Birdnote, I’m Mary McCann.


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Bird sounds provided by The Macaulay Library at the Cornell Lab of Ornithology, Ithaca, New York. Recorded by G.F. Budney.
Nancy Rumbel composed and played the theme music.
Producer: John Kessler
Executive Producer: Chris Peterson
© 2015 Tune In to Nature.org      June 2018/2020/2023     Narrator: Mary McCann

ID# TRES-02b-2020-6-1         TRES-02b

Research cited: see Cornell Hughes Scholars website, 2006.