drought, heatwaves and bush fires and koala is particularly vulnerable to bush fires. they re slow-moving. they live in highly combustible eucalyptus trees. we ve had a frequency. often koalas can survive fires, but these are unprecedented. they ve been what we call crown fires and they go right up to the top of the trees and stop the chance of ecaping. when the koala is in trouble, it s a sign that other species are in trouble. they re almost like the canary in the coal mine, so to speak. they re our flagship species. in protecting them, we re protecting thousands of other species and plants and as well. such an important issue. and thanks for taking the time, josey sherrad, thank you. pleasure. thank you. still to come here on the program, a massive black diamond shrouded in mystery is about to go up for sale. details on the stone dubbed the