Snails range from 0.5 mm to 61 cm long. The video explains the huge variety of snails crawling the earth. It includes snails with iron shells, snails that are venomous, and even snails that collect other snails! It highlights the unique...

So many animals, so many characteristics—how do we classify them all? A short tour of taxonomy awaits within a helpful Fuse School video on Evolution. Science scholars see how scientists sort animals into the main classes and what traits...

Did you know that a blue-ringed octopus has bright blue ring patterning on its body that it flashes to warn off predators? View this video showing how the octopus warns about its very poisonous venom. [0:59]

Hank introduces us to the "simplest" of the animals, complexity-wise: beginning with sponges (whose very inclusion in the list as "animals" has been called into question because they are so simple) and finishing with the most complex...

A nautilus' shell, when x-rayed, reveals the many chambers, which the nautilus uses to regulate buoyancy as it moves up and down in the ocean. Observe this process with this video! [1:54]

A many-armed sun star hunts an abalone. The abalone twists and turns using its foot and escapes. [2:16]

A video exploring the shells of a mollusc. See Geerat Vermeij observe, with his fingers, mollusc defense strategies as revealed by the design of their shells. For him, shell defense design is analogous to aircraft designed to protect...

Watch the adventures of Peter Ward in this video. As a paleontologist Peter Ward studied fossil nautiloids for years before he went to New Caledonia to see and trap living nautiloids. He's interested in the adaptations that allowed this...

The abalone demonstrates the basic body plan of molluscs. A foot is used for movement. A radula is a scraping tongue, and a mantle secretes the shell. [1:22]

The mantle deposits calcium into a protein matrix to make the shell. The inner crystalline structure prevents cracks from breaking the shell, and the mantle continually repairs the shell from the inside. [1:32]

An animation showing that molluscs' basic body plan includes a foot for mobility; a mantle that secretes a shell and a radula for eating. Learn that molluscs today show many variations on this original body plan. An abalone escapes a sea...