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Crocodiles can submerge and remain underwater for a variety of reasons. In most voluntary dives, crocodiles stay underwater for between 10 to 15 minutes. If the crocodile is trying to hide from a threat, dive length may be longer, up to 30 minutes or more.
Only 10 percent of alligator hatchlings survive to measure 4 feet long. But then they're home free, unless they are hit by a car or shot. A male can grow to 14 feet and weigh 1,000 pounds, produce and discard 3,000 teeth in a lifetime, and still be growing at age 40. And yet, says Lang, when you look at how an alligator's sex is determined, you might think they'd all have been extinct ages ago.