A flock of Black-tailed Godwits fly over Shenzhen Bay on Thursday. Shenzhen is an important stopover on birds’ East Asia-Australia migratory route. Between now and April of next year, a peak season for migratory birds in Shenzhen, is a good time for birdwatching. There are more than 200 species of birds residing in the city, according to official data.  Liu Xudong