"Most of these turtles have probably left the bay, but there are probably some out there," said Joanie Steinhaus, the group's Gulf of Mexico program director. "It's pretty raw conditions."
Tuesday's storm was particularly challenging for areas of southeast Texas still recovering from Hurricane Harvey in August.
Houston's Zoo was closed but prepared for the storm, a spokeswoman said.
"The zoo animals are safe and secure in their warm night houses and barns," spokeswoman Jackie Wallace said. "Where necessary, extra hay for bedding is given to the animals, and in some areas, the facilities are wrapped to give additional insulation."
(Special correspondent Jarvie reported from Atlanta and Times staff writer Hennessy-Fiske from Pecos, Texas.)
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