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Miners brought canaries into caves in order to detect methane gas. A canary can symbolize that the path is clear ahead.

Canaries also symbolize an early warning. If the canaries died in the mineshaft, then the miners knew that the air was not good and that they should leave. The canaries were more susceptible to the gas in the mines and thus provided an early warning system for the miners. Today, children with neurological disorders, especially autism, are called "canaries" because it is believed (by some) that they are the first to be showing evidence of the malignant effects of our toxic world in which humans are exposed to pollution, preservatives, chemicals and other man-made dangers. The idea is that if we don't learn from what has happened to these children, then we are all going to suffer from exposure to these things.

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