Gary Mulcahey / NMNH Some 17,000 years ago, on a wall of Lascaux cave in southwestern France, an artist made a painting of a deer with fantastically elongated antlers. To modern eyes, it looks ...

That makes marsh and swamp islands perfect for finding antlers dropped during daylight hours. Oftentimes, deer choose to bed against large boulders or downed trees. The horizontal log provides them ...