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Some animals respond to small amounts of poisonous gas and have been used as early warning systems. German soldiers kept cats in the trenches of the First World War to smell gas, and British miners kept budgies in cages because they died quickly if gas escaped into the mine. .. More >>
Some animals respond to small amounts of poisonous gas and have been used as early warning systems. German soldiers kept cats in the trenches of the First World War to smell gas, and British miners kept budgies in cages because they died quickly if gas escaped into the mine. .. More >>
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