Nature
This unsettling video shows a man reaching into a hole in a cave wall and pulling out a squirming cluster of creepy-crawlies.
Basically, a dad pulls out a clump of "daddy longlegs" – a colloquial name that tends to refer to the 6,000 species of arachnids that fall into the Opolione order.
While this sight might fill you with nightmares, the behavior of clustering together is pretty common in these species. They likely clump together for warmth in cool, dark caves, and to defend themselves from predators.
