“Pit ponies of the coal mines are easily the most controversial working horses in history. Here a mining horse poses with his coworkers. In the mechanization eliminated pit ponies altogether.” ~the horse: "ya, im a pit pony. whatcha gonna do?
A coal miner with the last canary to be used down underground. Canaries were used in the coal mines, to detect methane gas. If the canary died, the miners knew they had to leave or they would die as well.