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Tuesday, May 13, 2014

Great Big Radio

Great Big Radio, Great Big Radio Live, Great Big Radio Listen Online, Oldies Radio, USA

And those are the imprints of individual feet. So this animal had a lot of feet. It's thought to have been a giant millipede. It was about Online Radio four and a half feet long, one and a half metres. And it had or segments. A magnificent beast. Arthropleura. A giant millipede, probably the biggest terrestrial arthropod that has ever existed. The largest specimen discovered so far was nearly as long as a car Online Radio two and a half metres. The Carboniferous was the golden age for the arthropods, for the air was now particularly rich in oxygen. Today the atmosphere contains around % oxygen. Back in the Carboniferous, it was around % and that enabled Online Radio to grow very big indeed. But growing large was not their only success. Some other arthropods in these carboniferous rainforests were evolving in a different way. Instead of becoming huge and ponderous, they became agile and speedy. To do that it's better to be short rather than long, and some reduced their segments and ran around on just three pairs of legs, as silverfish and bristletails do today. These early insects then made another dramatic move Online Radio they developed wings and became the first Online Radio of any kind to fly. Truly the invertebrates had colonised not only the land, but the air. And in an atmosphere so rich in oxygen, they did so in a truly dramatic way. This giant dragonfly, the biggest flying insect that has ever existed, is called Meganeura. Its wings were nearly three feet across. But the golden age of the giant arthropods was not to last. The rainforest died back, and oxygen in the atmosphere dropped. Giant insects are no longer alive today and that may be because the proportion of oxygen in the atmosphere is very much lower. But nonetheless, insects have managed to find a way of overcoming the problems of size. They've become colonial. Just as in the far distant, remote past, individual cells clubbed together to form a larger organism, such as a sponge, so hundreds of thousands of individual insects, termites, have cooperated to build this nest.

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