Domestic cats are predators of small songbirds throughout the world. These birds change their foraging and communicative behavior when they detect cat predators. Theory suggests that the risk of such predators varies with predator behavior, however - a sleeping cat is not the same risk as an awake cat, for example. We propose a series of experiments with robotic cat models near feeders used by Carolina chickadees and tufted titmice, to determine the specific cues these birds use to assess risk.