• The Blanding’s turtle is named after Dr. William Blanding – an early naturalist from Philadelphia.
• Blanding’s turtles have a long lifespan and are not able to reproduce until they are 12-20 years old.
• The sex of turtle hatchlings is dependent on environmental temperatures. In general, female Blanding’s turtle hatchlings occur in nests with temperatures above 86°F and male hatchlings occur in nests with temperatures below 80°F. In nests with intermediate temperatures, a mix of male and female offspring will occur.
• Hatchling turtles rely on their sense of smell when moving from their nest to a wetland.
• Turtle egg and hatchling predators include shrews, skunks, opossums, raccoons and foxes.
• Unlike some aquatic turtles, Blanding’s turtles can swallow food without being in water.
• The Blanding’s turtle has specialized capillaries lining its mouths and cloaca that allows it to absorb oxygen from the water. These specialized blood vessels allow the turtle to stay underwater for long periods of time, as well as overwinter underwater.
• Blanding’s turtles have a hinge on the bottom part of their shell, or their plastron. The hinge on the Blanding’s turtle plastron is able to move once the turtle is two years old. By the time the turtle is five years old, it can move its hinge to fully close the bottom of its shell, thus protecting it from predators.

The International Union for the Conservation of Nature lists the Blanding’s turtle as “endangered.” This turtle is legally protected in many states where it occurs, including Minnesota. With a decreasing population, there are many threats to Blanding’s turtle survival. Habitat loss impacts this species as wetlands are drained or flooded, and upland areas are developed or converted for agriculture. The seasonal movements of this turtle put it at high risk of vehicle strikes as it slowly crosses roadways. Young turtles and eggs are preyed upon by a variety of predators including shrews, skunks, opossums, raccoons, foxes, domestic dogs and domestic cats.

There are a few things you can do to help Blanding’s turtles in Minnesota. When it’s safe to do so, assist turtles across roads in the direction they are moving. Don’t disturb turtle nests, and keep pets leashed so they can’t disturb nests, either. Help clean up litter, since trash can attract turtle predators such as raccoons. Leave shorelines natural and keep water free of pollution.

Things the Zoo’s Done/Doing

In 2018, the Minnesota Zoo received funding to begin partnering with other state agencies to better understand the threats facing Minnesota’s turtles. Using radio telemetry and GPS transmitters, we are tracking wood turtles and Blanding’s turtles to learn about habitat use and nesting locations. This data will provide information on turtle needs and help to inform best management strategies. We are also investigating road mortality impacts on turtles by surveying sites around the greater Twin Cities metro, and testing the effectiveness of mitigation strategies such as small animal exclusion fencing.