Garden bed weeders have surely noticed neon-red, tiny creatures, some barely a millimetre long. They are velvet mites, of the Trombidiidae family. Considering their miniature size they move quickly – as soil labourers certainly have noticed. They have good legs; full-grown velvet mites are predators who hunt arthropods and their eggs.
To be precise, for those with a zest for knowledge, the velvet mites are not insects but arachnids (harvestmen, or daddy longlegs, are for instance also arachnids).