Advertising

Halloween's over, which can mean only one terrible thing: these photos are not from a haunted house. They are real. These photos are from a paper published by the Entomological Society of America in 2010, documenting scientists' visit to the Black River Wastewater Treatment Plant in Baltimore after their managers put out a desperate plea for help from experts in 2009 to deal with an "extreme spider situation."

I see your problem here: this building is not currently on fire.
I see your problem here: this building is not currently on fire.

What you are looking at is an example of spiders from multiple species of the orb-weaver family cooperating to build a mega-nest that covered the whole 4-acre facility—populated by an estimated (not just estimated, but conservatively estimated) 107,000,000 spiders, reaching densities of 35,176 spiders in each square meter in the most crowded spots.

Sources: Entomological Society of America | Wired | Geekologie | Sploid