Possible Clues:

• They're found under a bridge
• Breathers?
• They sometimes flare
• We accept bouquets, doing a turn in kilts? Kelvin will have to go for lecturer
• Breathing pair
• What the septum separates
• Openings in the nose
• They may be flared
• Snort is likely at first to come out of them?
• Sounds as if one knows where to find both of them