It's already one of the world's most endangered animals, but the very survival of the Kemp Ridley turtle was dealt a massive blow by the BP oil spill in 2010.
At the time, scientists had been moving eggs in a desperate bid to save the species.
When Al Jazeera last visited the turtle sanctuary in 2010, three months after the spill, the number of nests had fallen sharply, and conservationists were concerned that the oil could threaten the survival of the three million year old species.
Now, as part of Al Jazeera's "What happened Next?" series, we travel back to the Tamaulipas reserve to see how the turtles are doing.
Al Jazeera's Rachel Levin reports from La Pesca, Mexico.