Dobhar-chú is a giant carnivorous river monster that lives in Ireland. It is said Dobhar-chú is a mix between a beaver and a dog, but many people have said that maybe this creature is a primitive beaver. However, the most consistent ancient description is of a great otter. Dobhar-chú's other names are, Doyarchu the traditional alias, Dobarcu, Dhuragoo, Sea Dog, or Irish-Gator.
Dobhar-chú is reported to have lived for a long time, since ancient Ireland, and they are very aggressive to humans and dogs, they usually attack in groups or maybe two Dobhar-chús, so one will attack first then, if it becomes tired, the friends may come to help, then they will drag their victim into water, but if the enemy runs away, they will follow it until it is caught. But, modern day, Dobhar-chú are very rare or maybe extinct, but it is reported Dobhar-chú can be found in Achill Island, west of County Mayo. In this island there is a lake named Sraheens Lough. Dobhar-chú are said to live there for now, the first modern sighting noted in 'A Description of West Connaught'(1684) by Roderick O'Flaherty. Another story in 2003 by Ireland artist Sean Corcoran and his wife on a Dobhar-chú in Omey Island, Connemara. They reportedly saw a giant creature with dark colouring, and membranes on the feet to swim. There is, interestingly, an archeological remain called Kinlough Stone that is the gravestone of a woman who was killed by a Dobhar-chú in the 17th century. Her name was Gráinne. Another piece of proof is the Glenade Stone, found in a Cornwall graveyard, where there is a Dobhar-chú figure painted above the grave.
- Ahuitzotl, a similar creature.