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I think this is what "yellow birds" refers to:
http://www.petcaretips.net/canary-coal-mine.html
Canaries were used in mines to detect poisonous gases before the miners could themselves.
I think this is what "yellow birds" refers to:
http://www.petcaretips.net/canary-coal-mine.html
Canaries were used in mines to detect poisonous gases before the miners could themselves.