These two geitodoris are a good example of how varied the colours can be in one species.  At first I thought I had only found one large nudibranch, only to discover that the sponge I thought it was feeding on was another smaller animal.  I was fortunate to find these in the lower intertidal zone (1.5 m) in a rocky, surge-prone habitat.  Their food sponge and their eggs were all neatly assembled. For more information and photos, see Sea Slugs of Hawaii.