The massive lower jaw was found to have a groove that would have allowed for an impressively wide gape. Hatzegopteryx's heavily built skull was in contrast to other skulls that were made up of lightweight plates. The necessary reduction in weight being achieved by the skull bones internal structure. Hatzegopteryx would have been flying the skies 65 million years ago above what is now Europe.
Source: http://www.bbc.co.uk/nature/life/Hatzegopteryx
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