They are part of a group of 193 Kemp's ridley turtles sent to Florida from New England last month, after an early cold snap caught them before their annual migration south.
"We took radiographs, bloodwork, physical examinations. We gave them in-water tests and observed them," said Bette Zirkelbach, manager of the Marathon facility that treats sick and injured sea turtles. "They essentially had no abnormalities. They were healthy turtles, just had to be warmed up."
The Turtle Hospital is still treating 18 of the Kemp's ridley turtles that are suffering from fungal pneumonia. Three of the turtles sent to Marathon have died.
Kemp's ridleys are the rarest of the four sea turtles that swim in Florida's waters. The others are loggerhead, green and leatherback turtles.
"They're critically endangered," Zirkelbach said.
And while Kemp's ridleys don't nest in Florida, they do have a connection to the Keys. They are named for Richard Kemp, a Key West fisherman who found a strange-looking turtle in 1880 and sent it to Harvard for identification.