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 only live in one place in the world, Australia. The koala only eats Eucalyptus leaves and it eats so many leaves, it smells like the leaves. The koala hops from tree to tree and climbs the trees to get the leaves. The koala will eat 2.5 pounds of food a day.