Among all wildlife subjects, I spent many years trying to locate and photograph crocodiles in Singapore. More recently, I have been chasing after wild otters. I am guessing we have about 50 otters or thereabouts around in Singapore mainland (as of Sep 2015). My photography and video works were also featured in mainstream newspaper, documentary films and publications.
I am currently using 2 camera systems, Canon and Panasonic. For city wildlife photography, my workhorse lens will be Sigma 50-500mm II, Sigma 150-600mm (S), Canon 100-400mm II and some times 70-200mm F2.8 II on Canon, and 100-400mm on Panasonic for Still, 35-100mm F2.8 or 42.5mm F1.2 for 4K videoing. I have yet to invest into super long prime lens due to current subject of interest and for mobility purpose. When I get into serious birding photography one day, I will. Perhaps some day, well but not today.
That aside, i do contribute my time and photography in helping out selective charity events, or meaningful projects over the years.