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Scientific classification
Tiktaalik was a lobe-finned fish from late Devonian Canada.  This fish is extremely important because it was one (if not the first) of the first vertebrates to walk on land.  Lobe-finned fish like Panderichthys and Eusthenopteron had very specialized fins suited to moving into shallow, swampy woods, but Tiktaalik had the ability to move onto land.  The lobe-finned fish developed lungs more suited to being on land and their fins grew digits.  Following him, Ichthyostega and Acanthostega were able to spend more in the water.

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