小白腰雨燕
House Swift
Apus nipalensis
無危。春季過境遷徙鳥，留鳥。小型雨燕。全身黑色，但腰部白色，喉部偏白。愛成群飛行，飛行時像小型的船錨，尾張開時呈方形微凹，不斷「茲茲」鳴叫。在屋簷下築巢繁殖，香港中文大學圖書館有全港最大的繁殖群落。
Least Concern. Spring Passage Migrant, Winter Visitor. Small swift. Black overall except white rump and whitish throat. Often fly in twittering flocks. In flight, looks like a small anchor, and tail square and slightly notched when spread. Call a continuously “si-si-”. Nests built under eaves. The largest breeding colony in Hong Kong is at the Main Library of Chinese University of Hong Kong.