The turtles began their journey at the start of April from Costa Rica's Playa Grande in the Las Baulas Marine Park.

CNN: Turtles in race to beat extinction

Already more than halfway through their journey, the race is building to an exciting climax on April 29 with Stephanie Colburtle -- named in honor of the comedian Stephen Colbert and backed by students at the Playa Grande Research Station -- currently holding a 27-mile advantage over her nearest rival, Billie.

CNN: Turtles in race to beat extinction