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Bicephalic Diamondback Terrapin Hatched in U.S.

A rare two-headed hatchling weighing 5.2 grams is currently being monitored by a veterinary team.

Updated on Sept. 28, 2026 in Reptiles

Bold vector editorial illustration of a small two-headed turtle hatchling resting on a flat surface, representing a rare biological occurrence.
A rare two-headed diamondback terrapin hatchling is being closely monitored by veterinary experts in the United States to ensure its survival. AI Illustration. Upload story photo >

A diamondback terrapin recently hatched with two heads in a rare occurrence documented by researchers. Veterinary staff are currently observing the hatchling, which weighs 5.2 grams, to monitor its behavior and appetite.

Why it matters

This biological event serves as a rare reminder of developmental complexities in wildlife, as bicephaly remains an uncommon condition for this coastal species.

The hatchling weighs 5.2 grams, or approximately 0.01 pounds. This is one of only three such bicephalic cases reported by the veterinary team within the last five years.

The players

Diamondback Terrapin

A turtle species native to coastal salt marshes in the northeastern United States that typically lives up to 40 years.

The details

Bicephaly occurs during embryonic development when twin embryos fail to separate properly inside the egg. Veterinary teams currently monitor such hatchlings by closely observing their daily appetite and physical behavior to ensure they can thrive despite the anatomical condition.

Timeline

  1. September 2026: The bicephalic terrapin was reported.

  2. Last five years: Two other bicephalic cases were documented by the team.

The Home Front

This hatching follows the rare pattern of developmental anomalies recently observed in small reptiles, including the case of the Simon and Garfunkel gecko in 2026. Such occurrences mark a departure from standard development trends for native species in the northeastern United States.

If you live in the northeastern United States near coastal marshes, be aware that diamondback terrapins are a protected part of the local ecosystem. Keep a safe distance from wildlife to avoid disturbing their natural development cycles.

The takeaway

Understanding the rarity of this condition highlights the complexity of reptilian development. While bicephaly is a singular biological event, monitoring the health of native turtle species remains a key role for local conservationists.

Further reading

Learn more about the species and care requirements in our Reptiles section.