A fundamental constant is one that has to be measured by experiment, rather than being derived from any other quantities. Which values we choose to make fundamental and which ones are derived are somewhat arbitrary.
Koalas are native to southeastern and eastern Australia, living in forests of eucalyptus trees. They are basically sedentary animals that need to sleep a lot to give them time to digest their food. Being on the ground all the time would be a disadvantage, because predators could catch them easily.
Koalas can live around 10-15 years, and they have only a few natural predators, including dingoes, large owls, eagles, and goannas, which generally only target juveniles. The IUCN Red List classifies the koala as a species of least concern. However, they face several threats to their survival. Motor vehicle accidents and dogs are major causes of death for koalas, along with disease. The largest threat they face, however, is loss of habitat caused by land clearing/development, bushfires, and eucalyptus tree dieback.