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Why do ants dig surface paths?

A few days ago I observed a corridor built and used by ants that went over a path in fields: Why do they build it? It seems it doesn't bring any considerable protection from the surrounding ...
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When birds fly in V-formation, how is it decided which bird gets to be the 'lead bird'?

I've read on Wikipedia and in other sources that the lead position alternates due to flight fatigue, but does it alternate between a small cabal of of leadership birds, or does (almost) every bird get ...