Smithsonian Magazine · People & society

Double-Headed Turtle Hatchling Found on Cape Cod

A rare diamondback terrapin hatchling with two heads was discovered by volunteers at a nesting site on Cape Cod and is now under veterinary care.

The hatchling, born with a congenital condition called bicephaly, weighs 5.2 grams and is exhibiting normal behaviors like swimming and eating. Veterinarians note that the left head appears to have a more dominant personality.

Bicephaly is a rare condition where an embryo does not fully separate during development. This is the third such diamondback terrapin seen at the Cape Wildlife Center in six years, and the fifth observed on Cape Cod since the early 2000s.

Further examination using CT scans and X-rays will be conducted as the turtle grows to understand its internal anatomy. The ultimate fate of the hatchling depends on its health and ability to survive independently; it may be released into the wild or remain in captivity.

Diamondback terrapins inhabit brackish waters along the northeastern U.S. and Gulf Coast. The species, which faces threats from climate change, coastal development, and fishing gear, is considered threatened in Massachusetts.

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