New Delhi, Sep 25 (PTI) A three-day census of dragonflies and damselflies began on Thursday across Delhi's seven biodiversity parks, with the exercise set to conclude on Saturday (September 27).

The results of the census will also be announced on the day of its conclusion as part of Wildlife Week celebrations.

Experts say dragonflies and damselflies play a vital ecological role by regulating insect populations, including mosquitoes and agricultural pests.

Their presence is also considered an indicator of water quality and wetland health, wildlife experts said.

The census is being carried out at the Delhi Development Authority's (DDA) seven biodiversity parks, which showcase two critical ecological landscapes of the city -- the Yamuna floodplains and the Aravalli hills.

These include t

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