V formation

[jim132]

Why do birds fly in a V?

[andy hughes]

Speculation, which is all that can be offered, puts forward two theories about the V formation in which birds fly. The first is aerodynamic - wind resistance is reduced for the birds behind the leader(s) which conserves valuable energy, and the image of a large formation may deter iarborne birds of prey which would attack single birds, or a group of two or three, but may be inhibited by the prospect of a formation group.

[incitatus]

Lorries do the same sort of thing on hills on the motorway