From this website, "The 8 Best Mothers in the Animal Kingdom":
http://www.neatorama.com/2011/05/07/the-8-best-mothers-in-the-animal-kingdom/
"Alligators
We don't tend to think of cold-blooded animals as the most caring parents, but alligators certainly break that mold. The female alligator creates nests of rotting organic matter that not only self-incubates, but also determine the sex of the babies. Nests that are constructed with leaves are warmer than those made with wet marsh, and thus, produce more males than cooler nests. Once mama gator has planned the sex of her litter, she will guard her nest from threats, including other alligators, who love to munch on baby gator nests. When the eggs hatch, she will load them into her mouth and then carry them into the water where she will continue to care for them for the following year, assuming they decide to stay near home. "
Pretty good mammas!!