Possible Clues:

• Organism needing oxygen - found in a beer that's off?
• Bacterium requiring oxygen, e.g.
• Adult bears regularly live without oxygen? One of these can't
• Breather
• Bacterium that needs oxygen in Belgium after a country with no leader goes belly up
• Oxygen-needing organism
• Oxygen-requiring bacterium
• Organism found in aged garment
• Organism that requires oxygen for life
• Entity needing oxygen