Desert scorpions are currently one of the only two mobs (the other being camels) to spawn in the Near Harad desert. They come out in the cool hours of the night and hide from the intense heat of the sun during the day.
They will attack any living creature and inflict a poison effect upon contact with their venomous sting, alike to the bite of the green Mirkwood spiders. They'll also come in different sizes. The bigger they are, the more damage they deal and the stronger they are, though they move significantly slower than their smaller counterparts. Running into a single scorpion is quite harmless, but being caught by a bigger group might be lethal for the player.
Animals of Middle-Earth