CONSPICUOUS COLOUR 41 
movement, form, position, sound, scent, and 
colour ; and probably in other ways. 
3. It is used for three purposes: A, to 
signal to friends’; B, to signal to enemies ; 
and C, rarely, to signal to food. 
4. The signals to enemies are of two kinds: 
A, to repel them ; B, to attract them. 
