Hattifatteners
You can tell the Hattifatteners (which glow in stormy weather) are close when there’s electricity in the air.
Hattifatteners’ impassive faces make it impossible to say whether they are happy, sad, or angry. The noiselessly travelling Hattifatteners always move in packs, and they never speak, eat, or drink anything.
Related
The Hattifatteners’ Cave
The Hattifatteners are by far some of the most mysterious creatures in Moominworld.