Final answer:
Eavesdroppers act as selection pressures on signalers in the context of signaling. An example of this is observed in Siamese fighting fish, where their aural signals can be heard by predators.
Step-by-step explanation:
Animals communicate using signals, such as visual, aural, chemical, and tactile cues. In the context of signaling, eavesdroppers act as selection pressures on signalers, meaning they influence the evolution of signals. One example of this is observed in Siamese fighting fish, where their aural signals (calls) can be heard by other fish, including predators. Eavesdroppers play a role in the selection of Siamese fighting fish signals, impacting the evolution of their signaling behavior.