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CynthiaW's avatar

Good morning. Eeeeew.

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Today's special animal friend, from a safe distance, is the alligator snapping turtle, Macrochelys temminckii. The largest freshwater turtle species in North America, it is not closely related to the common snapping turtle, Chelydra serpentina, which is the largest freshwater turtle in North Carolina. The alligator snapping turtle is found in wetlands from Florida to east Texas and up into Kansas, Missouri, Iowa, and other lower-tier Midwestern states.

Like some other reptiles, alligator snapping turtles continue growing throughout their lifespan. Really large ones are realistically reported to weigh over 250 lbs., and individuals around 175 lbs. are found pretty often. These very heavy old males have a carapace length over 30 inches, which doesn't seem all that big, but then you add on the powerful, crocodilian legs and the CLAWS, and it's obvious they could eat you. Although no human deaths are reliably attributed to the alligator snapping turtle, you may contemplate your theoretical edibility with this video:

https://www.youtube.com/watch?v=w-aILnSkMXU

A typical, adult specimen that you would pull up out of a Missouri farm pond on a fishing line weighs about 30 lbs. My grandfather would shoot them in the head and throw them back in for their relatives to eat. Alligator snapping turtles are generalist carnivores. Their typical diet includes fish (living and dead), other turtles (living and dead), water birds, eggs, and freshwater mollusks; mammals that swim or go near the shore or die can also be eaten.

Reproduction takes place annually in the spring. Courtship involves facing one another and moving heads from side to side, perhaps in a bar. If agreement is reached, the female receives sperm in her cloaca. She may store the sperm for up to two years if environmental conditions are not conducive to nesting. Normally, she builds a nest on the shore and lays 10 to 50 eggs about two months after mating. The eggs incubate for 100 to 140 days. Higher temperatures produce male offspring and lower temperatures female ones; "temperature dependent sex determination" is found in all turtle species. The eggs hatch in early fall.

The eggs and hatchlings are vulnerable to bird and mammal predators, and large fish or other reptiles can eat hatchlings in the water. They reach reproductive maturity in about 12 years, and their lifespan is estimated at 80 to 120 years, although 200 has been hypothesized. That would be the unverified 400 lb. specimen. Don't think about it too much.

Adult alligator snapping turtles have no natural predators. Humans are a threat, but not all that much of one. The species is considered vulnerable due to habitat loss and overcollection for the pet trade. (Here's your sign ...). They are protected in several states and banned in others, such as California. An invasive population is established in South Africa. Released individuals have been spotted in Central European countries such as the Czech Republic and Hungary; it is not clear whether breeding populations have taken hold in the wild. The E.U. is trying hard to keep them out!

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