None at all. There is only one main species of koala (Phascolarctus Cinereus), and some disagreement about whether there are two or three sub-species, or indeed, whether there are any sub-species at all.
According to the Australian Koala Foundation (see link below) the generally accepted sub-species are:
Koala
koala
Top hat
Topaz is a type of gemstone. It begins with T and ends with Z.
koala
A kazzo or a stuffed Koala
KOALA
There is only one species of koala - phascolarctus cinereus - so it can be said that this is the strongest koala.
A monkey that begins with the letter T is a Tamarin.
Such a koala would be diurnal. Koalas, however, tend to be nocturnal.
There is no need to capitalise the word 'koala' in a sentence. Nor do you use the word 'bear', as koalas are not bears.
Australia(koala bearpicture)