They’re only spiders.

The Baltimore Wastewater Treatment Plant put out a call for “extreme spider” help in 2009, when a giant spiderweb covered almost 4 acres of their facility. Scientists eventually estimated over 107 million spiders were living in the structure, with densities of 35,176 spiders per m³ in spots.

How many?

In some areas of the plant over 95% of space was filled with spider web.

What do that many spiders eat?

All recorded US megawebs have occurred near water. That makes sense, because spiders have to eat, and midges emerge in huge quantities from water where they breed and live.

I don’t even want to think about how many midges must have been spawning in the water treatment plant.