PhysOrg Posted December 2, 2013 Share Posted December 2, 2013 Beaks are a typical hallmark of modern birds and can be found in a huge variety of forms and shapes. However, it is less well known that keratin-covered beaks had already evolved in different groups of dinosaurs during the Cretaceous Period. Read the full article on PhysOrg Link to comment Share on other sites More sharing options...
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