No Collisions ?

[Bazile]

I have been wathching a lot of David Attenborough lately .

Anyway , there was one programme in which a massive shoal of fish was swimming swiftly around and changing directions rapidly .

In another programme , a flock of birds was also flying swiftly and again changing directions , rapidly

In both cases there were thousands of fish and birds and they were densley packed .

What got me wondering is how do they keep from colliding with each other ?

[snags]

http://www.thenakedscientists.com/forum/index.php?topic=11196.0

[gness]

I guess there will be a scientific explanation, Baz....but I like to think that they are highly aware of what is around them and able to react instantly.
Unlike many motorists....☺

[snags]

^ Actually that's not that great a link!

[boxtops]

Radar, and acute spatial awareness