Public documentation of bird pollination in PNG Dendrobiums?

[itzi]

Hey y'all, I've recently developed a dangerous interested in PNG orchids, specifically the beautiful Dendrobiums in the oxyglossum and pedilonum sections... Skimming information off the IOSPE and various blogs, I've read that a lot of mid-high altitude Dendrobiums and other orchids are bird pollinated, specifically by members of the Sunbird family. Does anyone know where I can find publications with writings or photos documenting that? I'm sure there are photos in the various books on the flora of the island, but I've not been able to find any ebooks free to the public. Thanks