Video shows hundreds of spiders 'swarming' the sky in Brazil
Hundreds of spiders appeared to swarm the sky in Brazil, a video of which surfaced online. It's a natural phenomenon, according to biologist Kayron Passos, who said that it was the result of a massive web hosting hundreds of spiders, all engaged in a mating ritual. The large-scale event appears as if spiders are drifting down from the sky.