All Snorks change colour with their moods, although this is only mentioned in two books, Comet in Moominland and (very briefly) Finn Family Moomintroll.
Halley's Comet | comet | Comet | de Havilland Comet | The Blue Comet | Moominland Midwinter | Captain Comet | Sozin's Comet: The Final Battle | Silver Comet Trail | Geykido Comet Records | De Havilland Comet | Comet Shoemaker–Levy 9 | Comet in Moominland | Time of the Comet | The Comet Song | Silver City Comet | PS ''Comet'' | PS Comet | Night of the Comet | Moomins and the Comet Chase | Great Comet of 1823 | Great Comet of 1811 | Great Comet of 1744 | Great Comet of 1556 | Frehley's Comet | Comet Shoemaker-Levy 9 | Comet nucleus | Comet Man | Comet Lulin | Comet Kohoutek |