10/08/2026
Diamondback Terrapins hatch from one egg in a rare case of "twinning."
Wild Care cared for a cold-stunned Diamondback Terrapin turtle from Wellfleet that laid six eggs while in their care. Two hatched and were released, two were infertile, one is still being incubated. The final egg was truly unusual, and appears to be consistent with twinning within a single turtle egg. Twinning is when there are two separately formed hatchlings sharing a common yolk/yolk-sac system. While this phenomenon is well documented in turtles, it is extremely rare for them to develop into two live, well-developed hatchlings.
The turtles were successfully separated by our staff using a method recommended by Rob Adamski, DVM, and Tracy Zustra, Berkshire County Turtle Rescue, Inc. One turtle is larger than the other, and the smaller turtle has a slightly deformed plastron, but both are alert. The yolk sacs are now nearly absorbed. Soon the hatchlings can start swim time to prepare for release into the wild. Watch for updates on "the twins" soon!
Diamondback Terrapins are a protected species in Massachusetts.