 So 15 million years ago Australia's climate was much hotter and much wetter than it is today and as a result we had rainforest over most of the continent and about 14 million years ago you see a really drastic change in that temperature. It dropped by about seven degrees Celsius. Not only did the climate get colder but it got drier as well and so those rainforests were largely replaced by much more open woodlands like what we see today. So our study shows that at this time of change where you have the wetter rainforest environment transitioning into the drier more open woodland environment we also see a decline in the species in the family of Australia's marsupial tigers and the rise in Australia's other marsupial carnivores which include the Tasmanian devil our quolls which are native marsupial cats and other smaller carnivorous marsupials. So we have a theory that perhaps the ear structure of the devils and quolls was better adapted and gave them a significant advantage in these more open woodland environments rather than the tigers in their closed rainforest environments. So this study shows a really strong link between climate change and both the evolution and extinction of species.