Tiny red creature moving quickly on granite rock. For size, compare with lichen.
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It looked like some I saw when I looked at Google images, I'll have to look again!
- is a small mite that is a pest of plants. It can do a lot of damage to houseplants, but also to some crops. It is usually found in quite large numbers. I think the one in your photo is sometimes referred to as a velvet mite. (The term 'red spider mite' should not be used because people use it to refer to any red mite).
I learn something new every day!
I only saw this one, perhaps because it was the only one to venture onto the rock I was looking at.
Lat/Lng: 50.04052, -5.68303
OS grid ref: SW363220