What worm shows a display of feathers?

The worm that displays a feather-like appearance is the feather duster worm, specifically from the family Sabellidae. These marine polychaete worms extend a crown of tentacle-like structures that resemble feathers, which they use for filter feeding. The vibrant colors of these "feathers" can attract attention and serve both feeding and camouflage purposes in their aquatic environments.