Animals
Spectacularly rare fossils of snakes that died huddled together 38 million years ago unearthed in Wyoming
About 38 million years ago, three snakes died while huddled together in what is now Wyoming. For decades, the identity of the fossils has been a mystery. Now, researchers have revealed the snakes are a newly identified species.
The fossils were discovered in the White River Formation in 1976, and researchers first described the snakes' clustering behavior in a 1986 study. The snakes may have been clustering for warmth and protection over winter, before being preserved in what became the first clear evidence of reptile social behavior in the fossil record, according to a statement from the University of Alberta. The fossils suggest these snakes may have been hibernating in groups like modern-day garter snakes (Thamnophis) do.
In a new study, published June 19 in the Zoological Journal of the Linnean Society, scientists used high-resolution CT scans to examine the fossils in more detail.
The team concluded that the snakes are related to modern-day boas and belong to a newly described species, which they called Hibernophis breithaupti. Hibernophis combines the Latin word "hibernare," meaning "to pass winter," with the Greek word "ophis," meaning "serpent." The name is a nod to the snakes' unusual social behavior.
Related: 50-foot 'king of the serpents' may have been the biggest snake to ever live
"This is really unusual for reptiles," study co-author Michael Caldwell, a vertebrate paleontologist and evolutionary biologist at the University of Alberta, said in the statement. "Of the almost 15,000 different kinds of reptile species alive today, none of them hibernate in the way that garter snakes do."
Garter snakes, which range across North America, congregate in communal dens between October and April, sometimes traveling long distances to reach one another, according to the National Park Service. By hibernating in clusters, the snakes stay warm when the temperature drops.
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