If you think of crocodylians in the United States (you do think about them, don’t you?), your mind probably settles on the alligators of the southeast. The extra-enthusiastic croc buff might even remember the American crocodile native to southern Florida (and a good chunk of Central and South America). The extra-extra-extra-enthusiastic croc buff (I am purposefully not using the word “nerd” here), though, knows that if you go back far enough in time, you can find a crocodylian just about anywhere and everywhere. The changing geographical distribution of gators, crocs, and their kin ties directly to changing environments.