How do birds not crash into each other?

Question

I’m not talking about geese. I’m talking about those huge flocks of birds. There’s 1000s of them and they never collide with each other. How?

In: Biology

Answer 1

It’s called “hive mentality” or “group mentality” you see the same thing with large schools of fish when a shark or whale attacks them, they just effortlessly morph in a group out of harms way.

Each individual is aware of their surroundings and in the group they just move based on what is around them (which in the group means other fish or birds) this in turn creates a hive mind where each individual reacts to the individuals around them reacting.