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How Evolution Reshaped the Woodcock

A brain and skull rearranged
© Nancy Magnusson View Large

Evolution works with what's at hand. So if you start with a normal bird skull – bill pointing forward, eyes oriented front or sideways, ears behind eyes – and introduce the challenge of seeing behind your head while your bill is pushed deeply into the soil, what do you get? The American Woodcock! With its long bill constantly probing the soil for earthworms, its entire skull has been rearranged. Relative to other birds, woodcocks' eyes have moved toward the top and rear of the skull, pushing the ear openings downward. Apparently the brain followed suit!

Full Transcript

Transcript: 

BirdNote®  

How Evolution Reshaped the Woodcock 

Written by Bob Sundstrom

This is BirdNote. 

[American Woodcock]

As birds go, there seems to be nothing typical about the American Woodcock. It’s technically a sandpiper, but has a plump, round body, a comically long, straight bill – and it lives on the ground in the forest. Probably never seen a beach or mudflat. [American Woodcock]

A woodcock’s eyes are large, and set high and far back on its head – so situated that it likely has panoramic vision both above and behind, to detect potential predators. And it needs to be watchful, because it spends much of the time with its long bill poked into the soil, in search of earthworms. The woodcock likely can’t see the tip of its bill, but it doesn’t really need to. The bill tip is fully loaded with diverse sensory receptors.

As evolution pushed the woodcock’s large eyes farther back in the skull, something had to give anatomically. So a woodcock’s ear openings are now set under the eyes, instead of behind, as in most birds. And its cerebellum, the part of the brain that handles muscular control, is no longer where it is in most birds - at the rear of the skull. It's ended up under the rest of the brain, just above the spinal column. Adaptation to its environment has, essentially, turned the woodcock’s brain upside down.

For BirdNote I'm Mary McCann 

###

Bird sounds provided by The Macaulay Library of Natural Sounds at the Cornell Lab of Ornithology, Ithaca, New York. American Woodcock [100723] recorded by W L Hershberger.
'Scotch Strathspey and Reel' by Percy Grainger performed by John Eliot Gardiner & Monteverdi Choir, Universal International Music. 
BirdNote's theme music was composed and played by Nancy Rumbel and John Kessler.
Producer: John Kessler
Executive Producer: Dominic Black
© 2015 Tune In to Nature.org  January 2015/2019  Narrator: Mary McCann 

ID#       AMWO-03-2015-01-20 AMWO-03

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