Protean strategies

Protean defence by prey animals
D. A. Humphries,P. M. Driver

"Attention is drawn to the widespread occurrence ofprotean phenomena, in which the appearance and behaviour of prey animals are rendered variable and irregular, as a weapon in the biological arms race between predators and their prey. Protean behaviour is defined as that behaviour which is sufficiently unsystematic to prevent a reactor predicting in detail the position or actions of the actor."

http://link.springer.com/article/10.1007%2FBF00815496?LI=true#page-1