Does anyone know what these tiny, fast invertebrates are... spiders or mites maybe? Many of them running around on a concrete drinking trough in a heathland nature reserve.
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Thanks Stephen, I hadn't even realised the two were different species in the 3rd photo, although that might explain why they had a bit of a tussle when they ran into each other.
Lat/Lng: 50.578919, -3.641175
OS grid ref: SX838767
Devon Wildlife Trust nature reserve