From the case:
Bird beak (photo)
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Bird head (with beak) for bird-beak sign of achalasia.
Author: Dschwen
Original file: http://commons.wikimedia.org/wiki/File:Gull_portrait_ca_usa.jpgI, the copyright holder of this work, hereby publish it under the following licenses: Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".
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