If you're interested in mating behavior, read Vladmir Dinet's book Dragon Songs. Hands-down the best description of crocodilian mating behavior and what it looks like you'll ever see.
Vladimir Dinets, a zoologist who had some really cool research on crocodilians and realized that basically, they're smart as fuck and have waaay more complex behavior than the scientific community had previously realized. He wrote a book about it, called Dragon Songs and it's very fascinating.