One of the best places in Hong Kong to watch the Fork Tailed Sunbird is in Tai Po Kau Nature Reserve. The bird feeds on different plants. To get the view of the bird I find there is only one tree where you are in almost the same level as the bird. The Coral tree is on your left side of the entrance to the education Centre. You will only find the birds when the tree is blooming (February [into March]). You need a lot of light if you want to make photos of the bird therefor choose a sunny day.