How Big Do Musk Turtles Get? Adults Run 2 to 5.5 Inches, and the 4-Inch Rule Decides the Rest
Picture a boardwalk souvenir stand in July. Between the airbrushed T-shirts and the hermit crabs sits a plastic tub of turtles, each about the size of a half-dollar, and a child is already asking for one. If you are the adult holding the wallet, the question that matters is not the price on the hand-lettered sign. It is whether that animal is four inches long, because that single measurement decides whether the sale is legal, how likely the turtle is to make a small child sick, and how much water it needs. The eastern musk turtle, Sternotherus odoratus , is the species where that number gets strange. It is a small freshwater turtle whose full adult size sits right on top of the legal line. So how big do musk turtles get? MassWildlife puts the average adult shell at 2 to 5 inches, and Virginia’s wildlife agency gives 3 to 5.5 inches. Some adults never reach four inches at all. A common musk turtle at Great Swamp National Wildlife Refuge, New Jersey. Credit: Colin Osborn/USFWS...