Birds are feathered, winged, two-legged, warm-blooded, egg-laying vertebrates. They also have a beak,  a four-chambered heart, and a lightweight but strong skeleton.

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(Aethopyga christinae) These small birds, with decurved bill, call a soft and frequent "zwink-zwink" and a metallic trill. Residents of Hong Kong, they are common and wide spread. They breed between April and June, eventually forming a ball of grass into a nest up in the trees. They can also be found on the most common postage stamp of Hong Kong.

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