Koalas have one of the smallest brains in proportion to body weight of any mammal. They are so dumb, that when presented with leaves on a flat surface instead of on branches, they are unable to recognize them as food and will not eat them.

Koala

For other uses, see Koala (disambiguation).

The koala (Phascolarctos cinereus, or, inaccurately, koala bear[a]) is an arboreal herbivorous marsupial native to Australia. It is the only extant representative of the family Phascolarctidae and its closest living relatives are the wombats, which comprise the family Vombatidae.[4]. The koala is found in coastal areas of the mainland’s eastern and southern regions, inhabiting Queensland, New South Wales, Victoria, and South Australia. It is easily recognisable by its stout, tailless body and large head with round, fluffy ears and large, spoon-shaped nose. The koala has a body length of 60–85 cm (24–33 in) and weighs 4–15 kg (9–33 lb). Pelage colour ranges from silver grey to chocolate brown. …
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Source: https://en.wikipedia.org/wiki/Koala#Description