Four new species of dragonfly have been added to the city's list, bringing the total to 116, according to a new Agriculture, Fisheries and Conservation Department publication.
It makes Hong Kong home to more than a seventh of China's total of number of dragonfly species.
'The city attracts so many dragonflies because it provides them with diverse habitats, such as sandy streams, freshwater ponds, reservoirs and fresh water and brackish water marshes,' said Dr Tam Tze-wai, the department's country parks ranger services officer.
Some of the varieties are listed as vulnerable species by the International Union for Conservation of Nature. One of them is the four-spot midget, or Mortonagrion Hirosei.
According to The Dragonflies of Hong Kong, this species - with four apple-green spots on the thorax - is about as long as your thumb, or 2.5 centimetres. It can be found in Hong Kong, Taiwan and Japan.
The four-spot midget is found in 10 locations in the city, up from seven in 2002, when the department first set up a working group to carry out territory-wide studies on the species.
