Allright, since I'm from Indonesia I can explain about fauna distributing in Indonesia. They are 3 of fauna distributing region like in the map below
A = Asian Region
B = Shift Asian-Australian Region
C = Australian Region
In Asian region the faunas are similar like in Asia. We can find Asian Elephants tigers, asian rhino and other animal in land of Sumatra. In java there is java rhino and buffalo. In this region there is thick jungle that can support big animal to live. Especially in sumatra and kalimantan (borneo).
In shift asian-australian there is the famous komodo dragon, tarsius and many more. This area are mountains, high ground and scrub like in komodo island.
In australian we can find fauna like in australia, Like Litoria Caerulea, Litoria infrafrenata, GTP (Green Tree Phyton), Blue tongue skink, and kangaroo
hope this will help
