Bank otters are actually very common in number, but you may go your whole life never seeing one, even if you walk a river path every day.
They mostly hunt at dawn and dusk, when the light does strange things and the old magic of the world comes into play. During the day they hide on the river banks, their pelt blending perfectly into the stones and reeds. Winters force them into their cosy dens to sleep, but sometimes males can be seen gathering more supplies if needed.
The greenery on their backs is a true plant that grows in the otter’s thick fur. Plant life varies with each location, but all the plants grown on a bank otter seem to have stronger magical and medicinal properties than their conventional counterparts. No-one has yet ascertained why…