Identifying droppings again

Hello again,

This second set of droppings are on a tree root. The tree is in a quiet reeded area beside a small river. It looks to be a sort of 'sign post' that anaimals use.

There are three droppings of varying ages photographed all together and individually. As I posted yesterday I know that there is a Mink around here. Is this the Mink or might it be something else?

Thanks for any advice,

Regards