Common Snapper vs Alligator Snapper

John took this photo of a snapping turtle at Peebles Island State Park, not far from his home in Troy, NY, US.

There are four distinct species of Chelydra (snapping turtles). The Northern common snapper, the Florida snapper, the Mexican snapper, and the Ecuadorian snapper. But wait, you say, what about the alligator snapping turtle? Ah, let us explore that question.


















The alligator snapping turtle doesn't belong to the the family of Chelydridae--they belong to the Macroclemys family. The snapper above is the Northern common snapper (Chelydra serpentina serpentina), the snapper you're most likely to encounter in the US. Here's a photo so you can tell the difference (common on the left, alligator on the right):



















The alligator snapper (Macroclemys temmincki) has a ridged shell, much more of a beak, and they are the only ones with that worm-shaped lure of a tongue. You see, common snappers dine on carrion (one site even says that some police departments use their carrion-sniffing skills to find corpses, but I need corroboration). But the alligator snapper uses its tongue to lure live fish into its beak.

We've got something of a 'Frodo Conundrum' going on here. The alligator snapper seems fouler (in appearance), but has a diet many humans would be fine with. The common snapper seems fairer, but eats decaying flesh. Frodo decided Aragorn was a good guy because he thought the Enemy would employ someone who looked fairer but seemed fouler. Does this mean he would choose the alligator snapper? Though, Frodo didn't factor in Aragorn's diet when he decided to leave with him...

...wow. I apologize for that geek tangent. I'll sign off now.

Thanks for the snapper, John.