Some sea turtles migrate thousands of miles to nesting spots. These world travellers return every year or three years to the same beach to lay their eggs. Scientists can't explain how turtles navigate such distances to the places.

This part of the text explains the migratory behavior of sea turtles, emphasizing their long-distance journeys to nesting grounds and the ongoing scientific mystery surrounding their navigation abilities. It positions them as remarkable "world travellers" due to this behavior.