Tiktaalik roseae (middle) and two modern analogs (ornate bichir (top) and alligator gar (bottom)) have expandable skulls. (IMAGE)

Proceedings of the National Academy of Sciences

Tiktaalik roseae (middle) and two modern analogs (ornate bichir (top) and alligator gar (bottom)) have expandable skulls.

Caption

Tiktaalik roseae (middle) and two modern analogs (ornate bichir (top) and alligator gar (bottom)) have expandable skulls.

Credit

Image Credit: Justin Lemberg (University of Chicago)

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