Ric Nattrass was an energetic and devoted educator and advocate for wildlife and conservation.  An irreplaceable character, he will be missed by all of us. He has encouraged many of us to advocate for wildlife and especially the koala in recent months.
There is a tributes page setup on Ric's website to add a comment about Ric and his work for any who may  like to make a tribute to Ric.
http://drivingyouwild.net.au/