because we are social creatures and this is why we’re together. birds are just following each other. we are on the same place because this is our nature, but at the end of the day we all mind our business, go wherever we think we need to go, but because we’re living closer this introduces disorder, everybody wants to go everywhere. birds just fly wherever their “friends” fly. if you take for example another social creatures like ants and bees you’ll see collisions do happen
Fish do the same thing, it’s called schooling! What makes a school of fish different from a schoal is that fish in a school move in near perfect unison. They accomplish this by being able to detech the electrical impulses of the muscle movements of their neighbors and are able to react in milliseconds. Only some specific kinds of fish can form schools, whereas any group of fish can act as a schoal.
I’m guessing here, but as birds can detect the magnetic field of the earth (this is how they migrate), birds which form large flocks probably have a very similar ability to fish that school.
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