Animals are a major group of multicellular organisms of the kingdom Animalia, and most known appeared in the fossil record as marine species during the Cambrian period about 542 million years ago. The Grant Museum at University College London is the only remaining university zoological museum in London. It houses around 67,000 specimens, covering the whole Animal Kingdom. Founded in 1828 as a teaching collection, the Museum is packed full of skeletons, mounted animals and specimens preserved in fluid. Many of the species are now endangered or extinct including the Tasmanian tiger or Thylacine, the Quagga, and the Dodo.