According to the flickr profile they are a brother and sister photography duo working out of Taipei, Taiwan.
There are HUNDREDS of photos! I highly encourage you to explore this gorgeous photostream. Even if you couldn't give a damn about birds!
Here is just a small sampling of their incredible shots:
Taiwan Yuhina, taken at Basianshan National Forest, Taiwan
Japanese White Eye, taken at Chinshan, Taiwan
Firecrest, taken at Alishan, Taiwan
Plumbeous Water Redstart, taken at Wuling Farm, Taiwan
Vivid Niltava, taken at Xin_Zhongheng, Taiwan
Fulvous-faced Flycatcher Warbler, taken at Wuling Farm, Taiwan
Rufous-bellied Blue Flycatcher, taken at Shi-Tou, Taiwan