I would guess this is from sometime between September 2010 (when the Sun Bears arrived from the Rare Species Conservation Centre, also around the time when the other species arrived from the RSCC including Pileated Gibbons and Smooth Coated Otters), and Summer 2011, as you can tell from the map, where many developments are mentioned to be opening. Thanks for these maps by the way, they're quite useful and just nice to see.
