I found small, brown worm like things in my cat’s bed, they are about 5mm long, what are they?

Image by Will Merydith
I was spading through the soil today to prep a bed for planting and there were buckets and buckets of earthworms. Probably 2-5k worms in one bed.

Question by Bel: I found small, brown worm like things in my cat’s bed, they are about 5mm long, what are they?

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