Dobhar-chú is an alleged water monster that lives in rivers and lakes of Ireland. Its name is translated as "water hound" and in appearance it is said that it is a strange mixture of an otter and a dog. Unlike other stories that usually describe reptiles or dinosaur like animal Dobhar-chu seems to be a mammal. This cryptid has a ferocious appetite and very nasty aggressive behaviour towards other animals and humans alike. Irish folklore is full of picturesque depictions of attacks of these animals. Its resemblances is often seen on grave stones, churches and other buildings.
It could be regarded as a legend or a fairly tale, but in 2003 witnesses reported seeing Dobhar- chu swimming pass them and making a strange haunting screech. It occurred on Omey Island in Connemara, County Galway.