'These Old World finches of the genus Serinus were used in coal mines to detect deadly gas'
canaries
COAL: These Old World finches of the genus Serinus were used in coal mines to detect deadly gas
These Old World finches of the genus Serinus were used in coal mines to detect deadly gas
These Old World finches of the genus Serinus were used in coal mines to detect deadly gas
COAL
canaries
COAL