Given this reference text about the Koala, tell me what makes up most of their diet, how long joeys spend in their mothers' pouches and what are some of the pathogens they are threatened by.

Eucalyptus makes up most of their diet. Joeys spend the first six to seven months of their lives in their mothers' pouches. They are threatened by pathogens like Chlamydiaceae and koala retrovirus.