Birders raise concern over drop in bird species at Periyakulam in Coimbatore

The amphitheatre constructed as part of Smart Cities Mission works at Periyakulam in Coimbatore.
| Photo Credit: SIVA SARAVANAN S

Birdwatchers claim the number of bird species visiting Periyakulam at Ukkadam in Coimbatore city has dropped significantly in the recent years, citing increased commercial infrastructure and human activity around the lake developed by the Coimbatore Corporation under the Smart Cities Mission.

K. Selvaganesh, a birdwatcher who has been monitoring the lake for over a decade, said species such as the green-winged teal, painted stork, and paddyfield pipit are now rarely spotted. “Earlier, we could record over 120 species a year. In 2023, only 116 were observed, in 2024 it was 86, and this year so far, just 82. Amphitheatre events, noise from boats, food kiosks, zip lining, and zip cycling are disturbing the natural behaviour of birds. Lighting around the lake is also an issue. Just like we cannot sleep with lights in our face, birds too need darkness where they roost,” he said.

To support lakefront maintenance and public engagement, the civic body introduced facilities including an amphitheatre, zip line, boating service, and food courts. However, bird enthusiasts say these changes are unsuitable for a wetland that has long served as a wintering ground for migratory species as well as resident birds.

Lake’s seasonal rhythm affected

R. Karthikeyan, another regular birdwatcher at the lake who last visited in April this year, said that floating solar panels and the practice of retaining water year-round have affected the lake’s natural seasonal rhythm. “The tank used to dry up during summer, exposing shallow patches and aquatic vegetation that supported species like the red-wattled lapwing, black-winged stilt, and jacanas. Now, with water stored throughout the year, that seasonal wetland dynamic—its hydroperiod—is disrupted,” he said.

He added that earlier, livestock such as sheep and cattle would graze along the bunds, maintaining open spaces and controlling grass growth. “Now everything is gated and concretised. That vegetation structure is lost. Birdwatching itself is restricted at night because the lakefront is closed to the public.”

A Corporation official said they have been focusing on maintaining biodiversity at the tank. Night-time activities are regulated to avoid disturbance to wildlife, the official added.