Lutra lutra

The Eurasian otter is found throughout Europe and Asia, and is also found in northwestern Africa. It is very territorial.

Religion and Impact
Iceland: There was a dwarf named Otter who was a shape-shifter and preferred the shape of an otter. He may have been a teen. One day he was sleeping on the river bank after having eaten a salmon. Loki, who was traveling with his friends Odin and Hoenir at the time, threw a rock at the otter to kill it. They skinned and ate him. When they found the nearby house of his family, they were shocked, and demanded blood money. The trio was to fill the skin up with regular gold, then cover up the said skin with red gold. They got all this gold by asking the sea goddess Ran for a net, which they then used on another shapeshifting dwarf, who preferred the form of a pike. He had a golden ring which could help him find lots of gold, so he had lots of gold. When Loki, Odin, and Hoenir took this gold Andvari the dwarf cursed all of it. Then when they gave the father of Otter the blood money, they became cursed. The eldest son became cursed with goldlust, and killed his father over it. He then became a dragon to guard his treasure. Then he was killed Sigurd, who was sent by Regin. Then Regin became cursed by the gold, and so on the story goes.

Ireland: In crytozoology there is said to be a giant otter called the King Otter, or Water-dog. Facts have not been yet checked by me. Couldn't find women's grave on findagrave.com.