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 living in the southern parts have adapted to the colder climate. They are larger and have thicker, grey coloured fur. Koalas from the warmer northern areas are more a browny colour and smaller. Koalas reach a maximum length of about 24 â 34 inches (60 â 85cm). An adult male koala can weigh between 17 â 30 pounds (8-14 kilograms) and a female between 13 â 25 pounds (6 - 11 kilograms). They have a life span of between 12 and 15 years.