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We are used to seeing spiders as predators, but what preys on spiders?

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Pompilid wasp
The clubionid spider in the photo has been stung and paralysed by a pompilid wasp Auplopus carbonarius. The wasp has bitten off most of the spider's legs, presumably to lighten the load as it carries its unfortunate prey back to its burrow.

Hymenopteran parasite
This Theridion (probably melanurum) is carrying a wasp larva. The larva grew larger by feeding on the spider and eventually killed its host.

Robber fly
This robberfly, Dioctria sp., has caught a small spider. Did it catch the spider in mid-air as it was ballooning or did it pick it off the ground or vegetation?

Other spiders
A cellar spider, Pholcus phalangioides, has caught a woodlouse spider, Dysdera sp., has wrapped it in silk and is eating it.