This anemone sometimes displays mutualism by attaching itself to a hermit crab or decorator crab.

Oregonia gracilis, commonly known as the graceful decorator crab, is a species of crab belonging to the family Oregoniidae.

Like other decorator crabs it habitually attaches other organisms to its back as camouflage or to warn off predators.

In 1889, William Bateson observed in detail the way that decorator crabs fix materials on their backs.

The decorator crabs attach plants, animals, small stones or shell fragments to their carapaces, providing camouflage that matches the local environment.

It is one of several decorator crabs, habitually covering itself in aposematic sponges which may also serve as camouflage.

The Octonauts stake out a thief, who turns out to be a decorator crab.

Self-decoration is employed by animals in different groups, including decorator crabs, which attach materials from their environment, as well as living organisms, to camouflage themselves.

Acanthonyx dentatus, the toothed decorator crab, is a species of crab in the family Inachidae.

It is closely related to the more common shallow-water species Oregonia gracilis, the graceful decorator crab.