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What are these soft white balls (pictured) found under a drain cover?

Our readers solve the mystery of the white blobs found in a drain in Wales

16 November 2022

Âé¶¹´«Ã½. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Roger Hooper Llechryd

What are these soft white balls, about 5 centimetres long, found under a drain cover (pictured below)?

Barbie Short
Troon, Ayrshire, UK

The white blobs look exactly like the spider egg sacs that hang from the walls of the pit prison in Dundonald Castle in Ayrshire, UK. Apparently, these are made by European cave spiders.

I work as a tour guide at the castle. Sometimes, when visitors are halfway down the ladder that descends into the pit prison, I ask them not to disturb the spiders – which are large, black and usually stationary.

Sometimes, the visitors go very quickly back…

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