Which method would a prey species avoid using in self-defence? 

A)  protective shells 
B)  acute senses of sight and smell 
C)  pursuit and ambush 
D)  camouflage

Pursuit and ambush are hunting techniques used by predators, not self-defense tactics used by prey species. Prey species try to avoid being caught altogether, rather than chasing or ambushing their predators. The other options (protective shells, acute senses, and camouflage) are all effective self-defense strategies commonly used by prey species.