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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The red-whiskered bulbul

Crested Bulbul or the red-whiskered BulBul -(Pycnonotus jocosus).  This pretty bird is a common sight in Hong Kong, found everywhere from woodland to gardens. They are not only frugivores (furit eaters), they also enjoy a tasty insect. still favoured as a pet today, they are known to live for up to eleven years in captivity. They have a rather chivalrous courtship, where the male bows his bead, drops his wings and spreads his tail. In Hong Kong they breed from April till June.