Cat
The domestic cat presents itself as an extraordinarily accessible companion animal. Cats may be acquired through shelters, breeders, or the time-honoured tradition of a cat simply appearing and refusing to leave. Adoption fees range from nominal to moderate, and the infrastructure required for cat maintenance—litter tray, food bowls, scratching post—remains within reach of most households. Cats adapt to flats, houses, farms, and canal boats with equal facility. One need not travel anywhere special to encounter a cat; the cat will find you.
Koala
Koala accessibility, by contrast, presents significant logistical challenges. The species exists exclusively in eastern Australia, requiring international travel for most of the world's population to achieve direct observation. Koalas cannot be kept as pets under Australian law, eliminating the domestic companionship pathway entirely. Wildlife sanctuaries offer supervised encounters, typically at premium pricing, and wild koala sightings require both geographical presence and considerable luck. The koala's accessibility score is constrained by immutable facts of biogeography and conservation legislation.