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.
These are areas where koalas are unable to live today, because the climate is too dry. Although we do not know the exact distribution of koalas before the Europeans arrived, we do know that that eucalyptus forests once covered much of eastern Australia.