How early tetrapods learned to live—and eat—on land (gallery)

Models of the skulls of Tiktaalik roseae (first) and the modern-day alligator gar (second), showing joints between functional regions of the skull.

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Gar and Tiktaalik
Exploded alligator gar skull
Exploded Tiktaalik skull
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Side-by-side comparison of Tiktaalik (top) and alligator gar (bottom) showing similarly shaped snouts that may suggest convergence in feeding strategies.
Image courtesy of Justin Lemberg (University of Chicago)