Four bird species recorded at the Bengaluru wetland for the first time have added another chapter to Puttenahalli Lake’s remarkable transformation into an urban wildlife refuge.
Bengaluru, Karnataka | September 28, 2026
A small urban lake in Bengaluru has received four notable new visitors, adding to the steadily growing diversity of birds finding refuge amid the expanding city.
Four bird species have been documented at Puttenahalli Lake, according to a report by Deccan Herald, providing another encouraging indication of the ecological importance that even relatively small urban wetlands can acquire when suitable habitat is protected.
The sightings are especially significant because Puttenahalli has undergone a remarkable transformation from a deteriorating waterbody into a thriving urban ecosystem supporting resident as well as migratory wildlife.
Four Species Join the Lake’s Bird List
The new sightings expand an already impressive bird inventory at Puttenahalli.
Birders and naturalists have documented more than 120 species of resident and migratory birds at the lake over the years, alongside butterflies, dragonflies, spiders, reptiles, amphibians and other fauna.
The growing list demonstrates how a relatively small waterbody surrounded by one of India’s largest cities can nevertheless function as an important feeding, resting and breeding habitat.
A 13-Acre Wildlife Refuge in the City
Puttenahalli Lake—also known locally as Puttakere, meaning “small lake” in Kannada—is situated in JP Nagar in south Bengaluru.
The lake covers about 13 acres and 25 guntas, with a walking-track perimeter of roughly 920 metres. It is fed by rainwater as well as treated water from a nearby apartment complex’s sewage-treatment plant.
Its relatively modest dimensions make its biodiversity particularly noteworthy.
Unlike large wilderness wetlands, Puttenahalli is embedded within a heavily urbanised landscape surrounded by residential development.
From Degraded Lake to Biodiversity Haven
Puttenahalli’s present condition did not happen by accident.
The lake was rejuvenated in 2009–10, after which local residents became closely involved in its maintenance and ecological restoration.
The Puttenahalli Neighbourhood Lake Improvement Trust (PNLIT) subsequently became the first citizens’ group to formally partner with Bengaluru’s civic authorities in maintaining a city lake.
Over the years, volunteers have worked to improve vegetation, water quality and wildlife habitat.
The transformation is visible around the shoreline. According to PNLIT, an area that had only a single wild date palm on the island in 2010 now supports nearly 500 trees, together with numerous shrubs and climbers. Most plantings have been native, medicinal or selected for their value to birds and insects.
Creating Habitat Specifically for Birds
Several restoration measures have directly benefited birdlife.
Vegetation has been developed around the lake’s perimeter, while bird perches have been installed within the lake basin. Floating biofiltration platforms have also been introduced to help improve water quality.
Commercial fishing has been kept away from the lake, helping reduce disturbance and maintain the aquatic ecosystem.
These interventions have gradually created a mosaic of open water, shoreline vegetation, trees and aquatic habitats capable of supporting birds with very different ecological requirements.
Birds Are Only Part of the Story
Puttenahalli’s biodiversity extends well beyond birds.
Wildlife documentation at the lake includes around 50 butterfly species, more than two dozen dragonflies, several damselflies, spiders, fish, amphibians and reptiles.
Among the butterflies recorded are the blue Mormon, common rose, crimson rose, tailed jay and Sahyadri birdwing.
The presence of such varied wildlife is important because a healthy wetland is not simply a collection of bird species. Birds depend upon the wider ecosystem—fish, insects, aquatic organisms, vegetation and suitable nesting and resting sites.
Why Four New Birds Matter
A first record of a bird at a lake does not necessarily mean that the species has permanently established itself there.
Bird populations are dynamic. Individuals may appear because of migration, dispersal, changes in food availability, weather or alterations to surrounding habitats.
Nevertheless, repeated additions to the species inventory provide valuable information about how birds are using Bengaluru’s network of surviving lakes.
Urban wetlands can act as ecological stepping stones, allowing birds to rest and feed while moving through landscapes increasingly dominated by buildings and roads.
That makes every surviving lake potentially important—not only as an isolated habitat, but as part of a wider network.
A Powerful Example of Citizen-Led Conservation
Perhaps the most remarkable aspect of Puttenahalli is not simply the number of birds it supports.
It is the story of how ordinary residents helped bring a deteriorating neighbourhood lake back to life.
PNLIT describes Puttenahalli as a “People’s Lake,” with local volunteers participating in tree planting, biodiversity documentation, bird walks, citizen-science programmes and other conservation activities.
More than a decade later, every new bird added to the lake’s records provides another measure of what that effort has achieved.
Small Wetland, Big Conservation Lesson
Puttenahalli may occupy only a tiny patch on Bengaluru’s sprawling urban map, but its wildlife offers a much larger lesson.
Urban biodiversity does not survive solely inside national parks and wildlife sanctuaries. Neighbourhood lakes, ponds, tree cover and other small natural spaces can collectively provide crucial refuges for wildlife.
The arrival of four previously unrecorded bird species therefore represents more than another addition to a checklist.
It reinforces an important conservation message: when an urban wetland is protected, restored and continuously cared for, wildlife can return—even in the middle of a megacity.
Source Credit: Deccan Herald, “Four winged visitors boost Puttenahalli Lake’s biodiversity.” Background information cross-checked with the Puttenahalli Neighbourhood Lake Improvement Trust.
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