Is this Cockerell's dorid wearing orange in decoration? Perhaps, but these q-tip-like appendages serve another function. They're called cerata, and function sort of like external gills, aiding the dorid in respiration! (Photo: Steve Lonhart/NOAA, taken in Monterey Bay National Marine Sanctuary)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/44124469278@N01">National Marine Sanctuaries</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/onms/44766003871/">Cockerells</a>