Birds are known for having beaks, however at what point between being a humongous therapod and tiny sparrow did they get them, and why?
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Sources:
https://www.nature.com/articles/s41586-018-0053-y
https://www.ncbi.nlm.nih.gov/pubmed/25964090
https://www.ncbi.nlm.nih.gov/pubmed/21978465
https://www.pnas.org/content/114/41/10930
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