| Both melanins and carotenoids are found in the rhamphotheca and in the scales of the feet. |
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| The bill is covered with a sheet of keratin, the rhamphotheca, which in petrels and a few other birds is divided into plates. |
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| This observation in Anomalospiza is confirmed but not enough Estrildidae were compared with rhamphotheca removed. |
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| This emerging avian disease, which has been termed avian keratin disorder, results in gross overgrowth of the rhamphotheca, the outer, keratinized layer of the beak. |
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