No fairy is more feared in Ireland than the pooka. This may be because it is always out and about after nightfall, creating harm and mischief, and because it can assume a variety of terrifying forms.

The guise in which it most often appears, however, is that of a sleek, dark horse with sulphurous yellow eyes and a long wild mane. In this form, it roams large areas of countryside at night, tearing down fences and gates, scattering livestock in terror, trampling crops and generally doing damage around remote farms.

In remote areas of County Down, the pooka becomes a small, deformed goblin who demands a share of the crop at the end of the harvest: for this reason several strands, known as the 'pooka's share', are left behind by the reapers. In parts of County Laois, the pooka becomes a huge, hairy bogeyman who terrifies those abroad at night; in Waterford and Wexford, it appears as an eagle with a massive wingspan; and in Roscommon, as a black goat with curling horns.

The mere sight of it may prevent hens laying their eggs or cows giving milk, and it is the curse of all late night travellers as it is known to swoop them up on to its back and then throw them into muddy ditches or bogholes. The pooka has the power of human speech, and it has been known to stop in front of certain houses and call out the names of those it wants to take upon its midnight dashes. If that person refuses, the pooka will vandalise their property because it is a very vindictive fairy.

The origins of the pooka are to some extent speculative. The name may come from the Scandinavian pook or puke, meaning 'nature spirit'. Such beings were very capricious and had to be continually placated or they would create havoc in the countryside, destroying crops and causing illness among livestock. Alternatively, the horse cults prevalent throughout the early Celtic world may have provided the underlying motif for the nightmare steed.

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