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If the wheel were big enough, I bet humans would use it too.
spoiler
It’s me, I’m that human.
They have these at some playgrounds here. It’s pretty fun!
Until you fall over.
Ideally the wheel should be big enough for a single human but not so big that it can fit multiple humans.
Source: I was once a child on a wheel big enough for multiple humans.
Is this running distance? That’s a completely unfair metric for the slug.
Slugs to be you then, I guess. :P
In all seriousness, the graph shows different species as fraction of total uses recorded. Since the paper is mostly about mice, and behavioural differences under different circumstances, it being unfair to the slugs is probably not such a big deal here.