In the first book of this series, “Animals of Ancient Seas,” (No. 47) we followed the evolution of animal life from the most primitive one-celled creatures to the fishes, and from the most primitive fishes to those which possessed lung-like organs that enabled them to breathe from air as well as water. The next stage in evolution was the development of feet and legs from the fish fin, and this was accomplished before the end of that geologic period known as the Devonian, or more commonly, as the “Age of Fishes.” True, no actual remains have been found, but one fortunate collector succeeded in getting out a fossil footprint, which is all that is needed to prove the case. This footprint was ma…
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