Koala around and its head has doubled in size. The eyes begin to open and fine fur grows on the forehead, nape, shoulders, and arms. At 26 weeks, the fully furred animal resembles an adult, and begins to poke its head out of the pouch. As the young koala approaches six months, the mother begins to prepare it for its eucalyptus diet by predigesting the leaves, producing a faecal pap that the joey eats from her cloacum. The pap is quite different in composition from regular faeces, resembling instead the contents of the caecum, which has a high concentration of bacteria.
Giant koala two koala species co-existed during the Pleistocene, occupying the same arboreal niche. The reason for the extinction of the larger of the two about 50,000 years ago is unknown, although there are various hypotheses for the extinction. The giant koala is an arboreal marsupial weighing about twice as much as a koala, about 30 kg. It is known as the largest tree dwelling marsupial that has ever lived. Scientists say that there is a clear similarity in the physical appearance from the modern koala. It is assumed that the diet of the giant koala is eucalyptus leaves, and that the