We all know about miners using canaries to detect carbon monoxide. But I was today days old when I learned that they made a special box for the canaries that could be sealed up and pumped full of oxygen when the canary started getting sick. 
The canary resuscitator | Science and Industry Museu...
save the bird!!!
The bird is part of the crew
and we don't leave miners behind
Rock and stone, brothers.
the birb 
“I’ve even read that many miners cared deeply for their canary companions, and some disliked the advent of electronic sensors in the mid-1980s because it meant they would lose this companionship.”