The title really says it all. Follow this link to see a metric crap-ton of fruit bats (the largest such gathering in the world) converge on a remote swamp in Zambia--an area only about the size of two or three soccer fields.
To take the shots, BBC camera crew had to swoop in on a powered hot-air balloon. Because there were so many bats that a helicopter couldn't fly. Oh. My. God.
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.