Editor's note: "Hidden World of Birds in City" is about exploring a world of birds that usually goes unnoticed in urban spaces. This episode features photographs from Wang Xiaobo, who has been bird-watching near his residential community in Beijing for the past eight years.

As of May 15, Wang Xiaobo has recorded 92 species of birds in Beijing, and the number continues to rise slowly yet at a steady pace. In 2020, the best year according to Wang's experience, he counted 147 avian species, of which 109 were recorded in May 2020. Although it's hard to say whether this year will outnumber last year's extraordinary score, the current momentum looks promising since a flock comprising of over 200 birds of prey was observed on Sunday right after its peak time. Another flock comprising 600 was seen flying five days ago.

More from 'Hidden World of Birds in City':

Hidden World of Birds in City: Peaks ended but migration lingers

Hidden World of Birds in City: New migration peak

Hidden World of Birds in City: Beauty captured on the way

Hidden World of Birds in City: Catching the train of late spring

Hidden World of Birds in City: Welcome back

Hidden World of Birds in City: Birds in blossom

Hidden World of Birds in City: A busy pond

Hidden World of Birds in City: Highlights

Hidden World of Birds in City: Air predators

Hidden World of Birds in City: Migratory birds

Hidden World of Birds in City: The birds awaken

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