Icthyostega
"Alive" after 360M years - at least on computer model - the long-extinct icthyostega shows how it became one of the first vertebrates to leave the sea and conquer the land.
Clumsily, as it turns out. It seems icthyostega didn't lumber along like a reptile or an amphibian. It was sort of a giant mudskipper, half-dragging itself in the new environment. Oh, well, Neil Armstrong didn't exactly look at home on the Moon, either....
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