Knowledge of sensation and perception can also be used to influence the behavior of other animals. Because people visit zoos during the daytime, nocturnal animals are often housed in areas bathed in only red light. Most nocturnal animals are colorblind, and as red light by itself is so difficult to see, the animals are tricked into perceiving that it is nighttime and become active for the viewers. Knowing that vultures have an exceptionally good sense of smell and that they are attracted to the scent of rotting meat allowed scientists to find an invisible but dangerous leak in a long, geographically isolated pipeline; after adding the aroma of rotting meat into the pipeline fuel, they simply waited to see where the vultures started circling—and knew where they would find the leak.
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