The anatomy of a canary, like many birds, lets it absorb oxygen during both inhalation and exhalation, making it twice as susceptible to poisonous air as other portable animals like mice. Canaries were used to detect carbon monoxide and other toxic gasses in coal mines in the U.K. until 1986.

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Working Like a Dog: 7 Animals with Jobs

The number one job for many animals is often simply being cute. However, for a few critters, working it means actual work—like detecting mines or taking out the trash or even predicting a seizure. In this list we’ve highlighted a few animals that have jobs ranging from the important to the unusual.