Want a broadside shot at a feeding deer? Scientists say you should face east
or west. German and Czech researchers have found that when grazing or resting, cattle
and deer tend to point their bodies toward Earth’s magnetic poles. While the research
probably applies more to grazers, such as cows and elk, than browsers like deer who
walk while feeding, it’s something to keep in mind next time you’re setting up a stand
over a bean field or clover plot.

http://www.sciam.com/article.cfm?id=cattle-deer-sense-magnetic-field