This display resembles the flight response of a small rodent. It has additionally been postulated that threat displays, such as gaping by the Caprimulgidae and wing-extension by the killdeer, and sexual displays, such as courtship dancing by stilts, can become incorporated into distraction displays where the bird is feigning injury. In both cases the incorporated components may increase conspicuousness, resulting in a more effective distraction display. In fish Stickleback fish have been documented performing distraction displays. A nesting male three-spined stickleback, when approached by a group of conspecifics, will perform a distraction display by digging or pointing into the substrate away from the nest in order to protect his eggs from cannibalism. There have been two explanations proposed for this behavior. One hypothesis is that the display arose from a courtship behavior in which the male normally "points" an approaching female towards his nest so that she may lay her eggs within it. Therefore, pointing at the sediment away from a nest containing eggs may divert a cannibalistic female's attention through sexual cues. A second hypothesis is that the stickleback distraction display arose from displaced foraging behavior and as such represents faux-foraging. In support of this hypothesis was the finding that all-male, all-female, and mixed foraging groups responded equally to the display, which would not be expected if it were indeed mimicking a sexual display. In mammals Though rarely documented in mammals, a few instances of distraction display have appeared in the literature. One researcher documented a distraction display performed by a female red squirrel in order to protect her young. When the nest was approached, the female attempted to lead the researcher away through the trees using a ventriloquistic call that resembled the cries of the young. An additional study documented distraction display in Mentawai langurs, whereby a male will call loudly and bounce on branches while the female and young are able to quietly hide. Costs and decision to display Risks While animals performing distraction displays are rarely documented as being killed, risks to the displaying animal do exist. One researcher observed and documented an instance in which a second predator became attracted to an animal already performing a distraction display. The displaying animal was killed by the second predator. Additionally, it has been shown that some predators are "smart", or have learned to recognize that distraction displays indicate a nearby nest. One study recorded a red fox