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Alligators (Alligator mississippiensis) begin their lives as eggs sheltered by their mothers. Mother alligators usually lay about 20 to 50 eggs in a nest made of mud, sticks, fronds and other plant matter. The nests are usually located along the banks of ponds and marshes, and are about 3 feet tall and 6 feet in diameter.
All of these eggs hatched female offspring. Eggs incubated at 34 degrees centigrade (93.2 degrees Fahrenheit) in the same period resulted in all male offspring. The reason, Cardeilhac said, is that alligators lack sex-determined chromosomes, so temperature determines their gender. Temperatures 34 degrees centigrade and above produce androgenic hormones inside the egg, which form male sex organs.