My vertebrate zoo group and I talked the other day about some of the early crocodilians like Purussasaurus and Sarcosuchus. Thought it might be a fruitful area for some YouTube surfing, and indeed it was.
The National Geographic video is dramatic enough, but it's a little speculative and doesn't provide much in the way of biological background. There's a little more of that available here.
I saw a lecture by Paul Sereno a few years ago prior to one of his African expeditions, not long before his Science paper on Sarcosuchus. The Sahara has proven to be a very fruitful hunting ground for Cretaceous crocodilians. They're great, but I'm a little partial to Deinosuchus - a fellow southerner.
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