For nearly 200 million years, Earth has been occupied by reptiles--a lineage of terrestrial vertebrates that includes some, like birds, that have invaded the aerial environment, and others, like turtles, that have invaded aquatic environments. With thirty-nine known species, Alabama harbors more turtle species than any other state in the nation, and its Mobile River basin is the center of the world's greatest biodiversity in turtles, surpassing all...
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Nature