in the damselfish, "chromis multilineata", females can often become infected with the parasite "anilocra chromis". in the event of infection, males do not allow infected females into the nest and do not mate with them. thus, to bypass this limitation to mating, infected females will often sneak into male nests. although the female is often immediately chased out, this behaviour serves as evidence that sneaking is not just an alternative male strategy. in fact, sneaking is just a common strategy for any sex that is denied mating to a certain class of animals. the strategy of these infected females is therefore another behavioural alternative strategy.