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Author Topic: The Little Red Spot on a Gull's Bill  (Read 1948 times)
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Donna
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« on: 18-Oct-11, 09:40:40 PM »

In the mid-20th Century, Dutch scientist Niko Tinbergen studied nesting Herring Gulls. He noticed that newly hatched chicks were fed by their parents only after they pecked at the adults’ bills. Tinbergen devised experiments that varied the shape and coloration of the adult’s bill. It became clear that the red spot on the adult gull’s bill was a crucial visual cue in a chick’s demands to be fed, and thus its survival.

Photo by: Tom Murry BirdNote

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valhalla
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« Reply #1 on: 19-Oct-11, 04:50:53 AM »

"I'm hungry, Mother"  Wink
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Donna
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« Reply #2 on: 19-Oct-11, 06:09:43 AM »

"I'm hungry, Mother"  Wink

or "Mum", depends where you live!  devil
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valhalla
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« Reply #3 on: 19-Oct-11, 10:34:53 AM »

"I'm hungry, Mother"  Wink

or "Mum", depends where you live!  devil

Rolly - 101 Dalmations (original cartoon version)  Wink
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