Add otters to the game

[Vahvapito]

Otter (lutra lutra) is relatively rare now but used to be common and was hunted for its fur.

They are about the size of the fox, fur might be a bit thicker. I am not an expert on otters but in game they would probably behave like beavers, but might spend a bit more time on land.

Adding them to the game would bring some fun variety to medium sized fur bearing animals.