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But there are so many that are curled in these deposits, together with others that have their backs arched upwards and others in other strange postures, that it seems that they are the victim of some kind of catastrophe. The sea floor, it seems, was quite steep. And every now and again, the mud that accumulated on the bottom slipped down in a submarine avalanche, carrying the Online Radio that lived in it and on it, higgledypiggeldy, and burying them alive. Moroccan trilobites are big business these days. Particularly rare species sell for thousands of pounds. The world's leading trilobite experts, such as Professor Richard Fortey, come here to study these extraordinary Online Radio. He believes that their external skeleton was the key to their success. The trilobites did almost everything you possibly can do with an exoskeleton. I think that skeleton was what gave them an advantage. They were protected. They could do all kinds of interesting things. They could grow spines. They could get flat, like pancakes. They could protect themselves by getting thick exoskeleton with pobbles all over it. It was a great advantage to them, just as it is to crabs and lobsters living today, which of course weren't around at the time of the trilobites. So they utilised the virtues of having a tough exoskeleton, to radiate into all kinds of ecological niches. You can see one of the most comprehensive collections of trilobite fossils just a few miles from where they're quarried, at Erfoud Museum. The collection here reveals just how varied the trilobite skeleton could be. There is no question that an exoskeleton gave the trilobites protection. But it also gave them something else of great value. There must have been many reasons why trilobites were so successful. But one of them, unquestionably, was their power of sight. They had eyes. not just eyespots that could tell the difference between light and dark, but complex eyes that could form detailed pictures of their surroundings, for the first time in the history of life. Eyes like these.