Why Do Dippers Dip?

BirdNote^® 
Why Do Dippers Dip? 
Written by Bob Sundstrom

This is BirdNote.

         [Song of the American Dipper]

An American Dipper calls across a rushing mountain stream. It’s a rotund little bird, with a stone-gray body that bobs rhythmically up and down, as if mounted on springs. But its feet are firmly planted on rocks just beneath the rolling water.

         [Repeat American Dipper song]

Why do dippers dip? Let’s consider three theories:

Theory one: The dipping motion sort of camouflages the dipper against the turbulent water, making it harder for predators to spot it.

Theory two: dipping helps the dipper see prey beneath the surface of the water.

Or theory three, which might be the most likely: dipping – as well as the rhythmic flicking of the dipper’s flashy white eyelids – may be a way of using body language to communicate, since rushing rivers can be so noisy they drown out bird calls.

         [Sound of rushing water on a mountain stream]

So if one day, as you muse by a mountain stream, you spot an American Dipper bobbing and winking in your direction, don’t take it personally. It’s probably beckoning to another dipper upstream.

For BirdNote, I’m Michael Stein.

This episode is brought to you by Teton Science Schools, specializing in outdoor learning experiences and education in Grand Teton National Park. More at Tetonscience.org.

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Senior Producer: Mark Bramhill
Producer: Sam Johnson
Managing Producer: Jazzi Johnson
Managing Producer: Ariana Remmel
Content Director: Jonese Franklin

Song of the American Dipper and Riparian Zone Nature SFXs #119 and # 17 recorded by Gordon Hempton of QuietPlanet.com. Additional stream ambient recorded by C. Peterson
© 2019 BirdNote   September 2016/2019 & August 2026
Narrator: Michael Stein

ID# AMDI-02c-2019-9-16    AMDI-02c