Slimy Doris

Dendrodoris krebsii

 A member of the Nudibranch Family of Mollusks. The "Bunny Rabbit" tail is called an anal gill and is used for the absorption of oxygen. Note in the very first picture the anal gill has been retracted, a response to feeling threatened. The two sensory projections on their head are called rhinophores.  These Nudibranch feed on sponges.  They can be found hiding under rocks in shallow areas.  They have an extended "girdle" around the perimeter of their body, which could possibly  be used for holding fast against strong wave action.