loga had to those uglow trotters following ocean currents they can travel more than 100 kilometers a day with their aerodynamic shape them paddle like. feet they are in bursts able to exceed speeds of 25 kilometers an hour. they have to come up to breathe every few hours because they have lungs not gills and they go ashore to lay their eggs. every few years a female sea turtle returns to the beach where she herself hatched digs a hole and deposits a clutch of around $100.00 eggs in it. then she leaves the nest and returns to the sea. after a few weeks the babies hatch and follow a light source such as moonlight reflected on the water to reach the ocean. bed later return as adults is known as natal homing. but how do sea turtles find their way back from 5000 of kilometers away. one theory is that they navigate by sensing our planet's magnetic field using it as a g.p.s. system of sorts. a long term study in eastern florida show that the pattern of nesting places of loch ahead sea turtles moved in tandem with subtle shifts in the earth's magnetic field lines. but is a home beach necessa