The weasel is so small, that it can follow mice into their own network of tunnels. Of all the Wadden Islands, the weasel is only found on the island of Sylt. In the past,you could find weases on Ameland and Terschelling, but are no longer found there. Weasels are also having a hard time surviving in many places on the mainland. This is often because many of their hunting grounds are mowed, resulting in fewer voles and therefore, fewer weasels.