Currently, three groups of chimpanzees have been habituated. While these devices have been shown to be successful, predators can become habituated to them. His work flowed from a tradition habituated to perceive threats to "our country". Due to their stationary and often predictable nature, wildlife quickly becomes habituated to propane cannons. There is published concern that people become habituated to the ubiquitous noise, diminishing its effectiveness. In experimentation with unreliable signalers, individuals became habituated to incorrect calls from a specific individual. They become habituated to a toy they have played with before. As the initial (cutting edge) dynamic quality becomes habituated, it turns into static patterns (viz.