Researchers think these foxes detect variations in the magnetic field, and faint sounds emanating from under the snow, to catch prey underneath 3 feet of snow cover.
"foxes prefer to jump in a particular direction... about 20 degrees off "magnetic north"... when they pointed in that particular northeasterly direction...they killed on 73 percent of their attacks... If they reversed direction, and jumped exactly the opposite way, they killed 60 percent of the time. But in all other directions...only 18 percent of those jumps were successful."
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