Visitors to the Beijing Botanical Garden have complained about thousands upon thousands of bedbugs flying in the garden's Cherry Ravine, reports Beijing Youth Daily.

Yang Zhihua, an engineer with the Beijing Municipal Bureau of Parks, said the bedbugs were gathering in the ravine, a sunny shelter protected from the wind, to settle in for the winter due to the suddenly chill weather.

Yang explained that the bureau would not spray pesticide to eliminate the bedbugs because Cherry Ravine is a protected natural area.

Besides, he added, the large number of bedbugs would eventually attract lot of birds, their natural predators, to the site.

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