TNRTB Archive - Retained for reference information
Biologists have discovered a remarkable design feature in green sea turtles. They noted that these turtles possess the capacity to return from hundreds of miles away in all different directions to a particular coastal site with pinpoint accuracy. They performed experiments on captured turtles that were placed in large tanks where the magnetic field intensity and direction could be controlled. They simulated the ambient magnetic field of different regions throughout an ocean region encompassing over 200,000 square miles and found that the turtles consistently oriented themselves in the direction that would have returned them to the coastal site. This experiment demonstrates that green sea turtles possess a global positioning system that relies on a complex compass and a geomagnetic map of their ocean habitat. Such an advanced system defies a naturalistic explanation.
Kenneth J. Lohmann, et al, “Geomagnetic Map Used in Sea-Turtle Navigation,” Nature, 428 (2004), pp. 909-910.
http://www.nature.com/ cgi-taf/DynaPage.taf?file=/nature/journal/v428/n6986/abs/nature428909a _fs.html
RTB article: Facts for Faith articles on biological evolution