Molluscs
Soft-bodied animals, most with a shell: snails, limpets, oysters, mussels and scallops. The group also includes slugs and nudibranchs, which have lost their shells, and the octopus, squid and cuttlefish, some of the cleverest animals without a backbone.
The nautilus is the only living relative of the octopus that still keeps an outside shell.
11 animals, A to Z.
- CuttlefishMarine cephalopods with W-shaped pupils, eight arms and two tentacles, and an internal shell, the cuttlebone, that controls buoyancy.
- LimpetSea snails with a cone-shaped shell and a strong muscular foot that clamps them to rocks on the shore.
- MusselBivalve molluscs of salt and fresh water with long, uneven shells, often dark blue, black or brown.
- NautilusNine species of shelled cephalopods from the Indo-Pacific, the last living members of an ancient group.
- NudibranchAbout 3,000 species of soft-bodied sea slugs that shed their shell after the larval stage, many of them in startling colours.
- OctopusEight-armed molluscs, about 300 species, with three hearts and copper-based blood.
- OysterSaltwater bivalve molluscs with rough, often irregular shells.
- ScallopSea bivalves found in every ocean but never in fresh water.
- SlugLand gastropods with no shell, or only a tiny internal one.
- SnailA gastropod with a coiled shell big enough to pull itself into.
- SquidFast-swimming molluscs with large eyes, eight arms and two long tentacles.
How each answer is decided: How we answer. Every animal, in one list: All animals.