In grebes of the genus Podilymbus, the upper barbs of the forehead feathers are fused with the shaft into a somewhat flattened, pointed structure. We believe that when raised, these feathers may indicate a low probability of attack.
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1 September 2000
Forehead Feathers of the Pied-Billed and Atitlán Grebes
Robert W. Storer,
Martin J. Muller
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