Awesome animal! This could help you find images:
http://images.google.com.au/images?hl=en&sa=N&resnum=0&q=golden-mantled tree kangaroo&ie=UTF-8&oe=UTF-8&um=1&tab=wiHere's a good one. X3
About the only thing that might be hard about doing this animal, is its instincts, behaviours and habits. If it's new, there won't be many resources on it. So if you got it on the island and your character began to be influenced by it, you might find it a bit hard to write out the animalistic instinct drives.
mrgreen 
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