If alligator eggs are kept above 86 degrees Fahrenheit, all the babies will be males. If incubated at below 86 degrees, all females will result. One theory about the extinction of dinosaurs is that with a global change in temperature, only one sex would have been born. Of course we now know that dinosaurs were mostly unlike alligators. Alligators have their legs to their sides, so they rest on their bellies. Most dinosaurs had legs under their bellies. Dinosaurs may also have been warm-blooded.