Turkey Vultures were (and sometimes still are) used by natural gas companies to pinpoint pipeline leaks. Natural gas is by itself odorless, so gas companies add the chemical ethyl mercaptan to it so that people can smell gas leaks. As it happens, ethyl mercaptan is one of the chemicals emitted by putrefying animal carcasses, and so, strangely, leaks in natural gas pipelines attract congregations of Turkey Vultures.
As gas leakage attract Vultures so company worker can detect gas leakage by following them.
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