Camel Spiders / sun spiders / whip scorpions or whatever you call them WILL chase you at pretty high speed...because as a desert creature they are instinctively driven to seek shade to cool down and humans cast a big, moving shadow. When a stationary alternative is available they will disengage and idle under that instead.
These adaptive actions allow them to cover expanses of land during the day instead of having to wait until evening or nightfall to roam.
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