FILE - This Oct. 19, 1994 file photo shows two sockeye salmon at the mouth of the Adams River at the Roderick Haig-Brown Provincial Park in British Columbia, Canada. A new study suggests that, like birds migrating over long distances, salmon use the earth's magnetic field to find their way home, Friday, Feb. 8, 2013. The study published this week in the journal Current Biology looked at 56 years of fisheries data about which route sockeye salmon used when they returned to the Fraser River in British Columbia. Scientists found that which way the salmon chose to go around Vancouver Island matched natural shifts in the geomagnetic field. (AP Photo/Gary Stewart, File)