If they had basic spatial cognition, they would not have needed that bridge. Good example of the emergent intelligence of groups instead of cohesive individual minds? https://twitter.com/boni_bo/status/1026067216360501248 …
I suspect you give them too much credit: they don’t have communication or spatial models, so they did not start building from two sides. They probably just crawled on each other, slipped away from the ceiling and then kept elongating the bridge to account for additional slippage.
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Then I guess they get lucky very often:https://www.youtube.com/watch?v=A4uv27nSaH4 …
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Looks like they simply use smell to walk towards clumps of other ants, and stay in place while being trampled on? (Some ant species also have a rough homing algorithm based on polarized sky light direction and crawled distance.) Does it look impressive to you?
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