From Paul Langford
The article on birds flocking refers to them “flying in one great and inexplicable mass” (26 June, p 48). It seems to me that it has (since) been explained as emergent group behaviour built on very simple individual behaviour following these rules:
1. Keep together.
2. But not too close.
3. Follow the one in front.
Advertisement
4. Move away from anything that might be a predator.
5. Go towards a goal – roost, feeding place, water, hide under cover…
A relatively simple computer simulation can and does demonstrate this behaviour.
Southall, Middlesex, UK
