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.
A pair of kingfishers seems to have decided to build their nest in a hole at the lakeside in Wang's community this year. According to Wang, it is not rare to see kingfishers forging in this community, but it is not common to see them build nests and breed here. A pair had successfully bred here last year, making it a record in his bird-watching history.
To sufficiently protect its nestlings, the bird usually chooses holes on cliffs or slopes to settle in.