The impossible claim

The decorator crab glues a living costume onto itself with hook-shaped bristles — natural Velcro — even wearing stinging anemones as a wearable threat.

The verified facts

Decorator crabs (the velcro crab, Camposcia retusa, is the classic example) dress themselves in pieces of other organisms:

  • Natural Velcro: their shells and legs carry curved, hook-like bristles (setae); they snip material to size with their claws, soften it with their mouthparts, then press it into the hooks
  • The wardrobe: algae, sponges, hydroids, bryozoans, small coral pieces — some pieces STAY ALIVE and keep growing on the crab’s back (Western Australian Museum; Biodiversity of Singapore)
  • A wearable threat: some species deliberately choose noxious or stinging materials — stinging anemones, toxic algae — gaining ‘associational defense’ (New Scientist); not every species does this
  • Tailor’s recycling: decorations attach to the molted shell; many decorator crabs salvage the old outfit and reattach it to the freshly hardened new shell
  • Size: the velcro crab’s carapace is only about 3 cm wide; the full animal with legs reaches about 10 cm

The famous boxing crab (Lybia) carries anemones in its claws — a related, different behavior. ‘Individual artistic taste’ isn’t scientifically established, but species show clear selective preferences — including for chemically defended plants.

Watch

🎬 See the Short on YouTube — This Crab Steals Parts of Other Animals to Dress Itself

Sources

  • Western Australian Museum. Camposcia retusa — Velcro Crab collections.
  • Biodiversity of Singapore. Camposcia retusa decorator behaviour.
  • New Scientist — Zoologger. Decorator crabs accessorise to avoid being eaten (newscientist.com/article/dn27702).
  • SeaLifeBase. Camposcia retusa summary.

Part of Impossible Creatures — every fact verified, every creature real. Watch the Shorts at https://www.youtube.com/shorts/MSukONJ2LkU.