Seaslug!

I am a huge fan of seaslugs, or nudibranchs. This little guy,
Polycera faeroensis, is about the size of your fingernail, and happily munching his way through some bryozoans, caught up on the red algae.

Nudibranchs come in an amazing variety of shapes, sizes and colours, this one is quite common; but no less enchanting for all that.