BirdNote® How Brown Pelicans Dive
Air Date: Week of April 8, 2011
Evolution has helped these seabirds dive through water at just the right angle to efficiently capture their next meal. Mary McCann has this BirdNote® about the brown pelican.
[BIRD NOTE THEME]
GELLERMAN: We’re in debt to poet Dixon Lanier Merritt for this little ditty:
A wonderful bird is the pelican
His bill will hold more than his belican
He can take in his beak
Food enough for a week
But I'm damned if I see how the helican.
GELLERMAN: And that's not the only thing to remark about this remarkable bird, as Mary McCann reveals in this week's BirdNote®.
[SOUNDS OF WAVES AND SURF]
MCCANN: Imagine a line of Brown Pelicans flying just above the breaking surf of the coast. Perhaps you’ve watched - and heard - these large, long-billed birds fishing. They circle high, then dive head-first, plunging underwater to catch fish.
MCCANN: But doesn’t that hurt? Anyone who’s taken a belly flop off a diving board knows the powerful force of hitting the water. Several adaptations protect brown pelicans as they dive, sometimes from as high as 60 feet. Air sacs beneath the skin on their breasts act like cushions. Also, while diving, a pelican rotates its body ever so slightly to the left. This rotation helps avoid injury to the esophagus and trachea, which are located on the right side of the bird’s neck. Pelicans have also learned that a steep dive angle, between 60 and 90 degrees, reduces aiming errors caused by surface water refraction. We know that pelicans learn this behavior because adults are better marksmen than young birds.
MCCANN: Upon impact, the Brown Pelican opens its bill and expands its pouch, trapping small fish inside. Then the bird pops to the surface, spills out the water, and gulps down dinner.
GELLERMAN: That’s Mary McCann of BirdNote®. And for an eyeful of brown pelicans, dive into the photos on our website - LOE dot ORG.
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