 They are solitary corals. These are the moulds of where the corals were. They are solitary corals. They are about the size of my little finger. They look like little, just imagine, little ice cream cone. And they grow in a vertical fashion in cold water. This is very different from the tropical corals that are colonial. But around Antarctica, in the deep sea, you've got solitary corals. And they feed on the plankton that settles through the water. We call that marine snow. There is another group of organisms called bryzoids. They're colonial. They're very fragile and they're all lying down like the corals, which I'll explain in a minute. But the bryzoids again, they've got little hairs that feed on the plankton that's in the water.