The Raft Spider (Dolomedes fimbriatus) is a semi-aquatic member of the family Pisauridaeone which is in the genus Dolomedes. It is one of Ireland’s largest spiders. Also known as the Hunting Spider or the Jesus Christ spider for its ability to walk on water. It occurs in sphagnum bogs. Main prey items include aquatic and terrestrial insects, invertebrates as well as tadpoles which it detects using its forelegs to sense any vibrations on the water surface. If threatened, it can submerge itself under water for up to 60 minutes. Patrick J. O'Keeffe / Raw Birds |