Try this. Go to a field of growing wheat. Wander around until you find a place a deer has bedded down. Study the area, the stalks of wheat, the way the stems are bent or broken, the way the stems are all jackstrawed together. Then read the stuff on crop circles that demonstrates extra terrestrial causation. The obvious conclusion is that the White Tail Deer is a creature from outer space.
Somebody has way too much time on their hands.
I’ll say this, though, tromping down standing corn (maize) when it is more than head high to a tall man takes some doing. I figure that the aliens are short and therefore limit themselves to waist high wheat.