Jenny Clack visits a site with fossilized tracks of an early tetrapod. She and her assistant hypothesize about what the animal was doing around 370 million years ago.
Whitey Hagadorn plays detective in deep time as he finds the traces of early animals. He hypothesizes about how the tracks were preserved.
Simon Braddy discovers fossil tracks in the field and looks at museum collections to figure out who made the track.
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