Turtles have adapted very well to life in the sea. They migrate over long distances, but must always find their way back to their former nesting places to lay eggs. The laying cycles vary, they usually take place every 2 years. The development in the egg takes 2 months.
Their death rate is very high, 1 in 100, and all 7 species are considered threatened and highly endangered.

Excerpt from "Life in the Red Sea." iBooks.