Ants have a visual range of about 1-2 feet. So if they’re 5 feet off the ground and just drop, they have no way of knowing what they’ll land on. It could be a stream that carries them away.
From an evolutionary perspective, it’s probably safest to go along a path you can trust, because it’s got a pheromone trail, than to just launch yourself into the unknown on a regular basis. Sure, walking takes longer, but it’s not like an ant is in a hurry to go anywhere, so who cares?
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