Two-headed baby turtle discovered in Cape Cod

A two-headed baby turtle was found at a protected nesting site on Cape Cod in Massachusetts last month. The diamondback terrapin hatchling, which weighs approximately as much as a nickel, exhibits bicephaly, a rare developmental anomaly, as reported by the Cape Wildlife Center on Facebook. The turtle was brought to the wildlife center by the Mass Audubon Wellfleet Bay Wildlife Sanctuary for close monitoring and care. Bicephaly occurs when an animal is born with two functioning heads on a single body, typically resulting from the incomplete splitting of a single embryo during the formation of identical twins, according to Live Science. The Cape Wildlife Center noted that they have only observed two other cases of bicephaly in the past five years, making this turtle “especially rare.” The center stated, “While we’ve encountered this unusual condition before, every case gives us another opportunity to learn more about these fascinating animals’ anatomy and physiology.” The team is currently monitoring the turtle's appetite, growth, and behavior. Zak Mertz, CEO of New England Wildlife Centers, described the discovery as an uncommon example of bicephaly in turtles and expressed the need for further study. Mertz indicated that the condition may be influenced by genetic and epigenetic factors, as well as environmental factors such as temperature and humidity during incubation. He noted that while two-headed turtles are rare, other recent examples of bicephaly include a two-headed porpoise found off the coast of the Netherlands and a double-headed dolphin found in Turkey. A 2021 study titled “Two heads are not always better than one” found that double-headed and partially duplicated sea turtles often have significant craniofacial and spinal abnormalities. Turtles with two heads typically are smaller than their counterparts and face survival challenges due to their abnormal anatomy. Researchers assert that monitoring these rare cases is crucial for understanding the health of the entire species and its habitat. Diamondback terrapins are found in brackish marshlands along the Atlantic and Gulf coasts of the US and are classified as threatened by the Massachusetts Endangered Species Act.