Decoy switches frogs’ mating call preference
Third option alters choice of previous alternatives
CALLING CARD Male túngara frogs like this one attract their mates with a series of chirpy croaks. When picking between two calls, females tend to prefer a lower tone and more quickly repeated calls, but adding in a third suitor with an unattractive song may change a female’s preference between the two other males.
A.M. Lea