Zosterops japonicus simplex

The Japanese White-eye is a small bird with olive-green upperparts, grey-white underparts, yellow throat and a conspicuous white eye-ring.

They are found in orchards, gardens, and open woods below 1,200 meters, but are seldom seen in old-growth forests. Lively and active, Japanese White-eyes feed primarily on the nectar of cherry blossoms, cotton trees, and coral bean trees. They are gregarious and always move about in a group. If one bird in the group senses danger, it will call to warn others. Japanese White-eyes tend to form large flocks in the fall and winter. They are constantly moving around in trees in search of food, and often hang upside down to peck at insects, pollen, and fruits.

Japanese White-eyes give a melodious call, especially during the breeding season from April to July. Their cup-shaped nests are built in groves of trees, and constructed from a variety of materials, including plant stalks and roots, spider webs, and feathers. These nests are completely suspended from the twigs or branches from which they hang, and have no support underneath — a truly advanced method of nest construction. Females lay two or three eggs per clutch. They are a common resident of Taiwan and can be easily observed all year round.

Reference : The complete guide to birds in Taiwan (Jin-yuan Wang)