Mining foreman R. Thornburg shows a small cage with a canary used for testing carbon monoxide gas in 1928. George McCaa, U.S. Bureau of Mines Never mind the gas—it was automation that got them in the ...
bird cages ; canary cages ; parrot cages ; mocking bird cages ; robin cages ; finch cages ; red bird cages ; breeding cages ; traveling cages ; bird store cages ; squirrel cages ; mouse cages ; mouse ...
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