Do vultures detect carrion by sight or by smell? The lightbulb moment came to ornithologist Kenneth Stager when a Union Oil employee told him of vultures congregating at the spots along pipelines where gas leaks were occurring. Why would they do that? Because a key ingredient in the odor of carrion is ethyl mercaptan — the same substance companies add to odorless natural gas in their pipelines, so they could smell if there was a leak. So now we know that vultures can spot carrion by either sight or smell.

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