As plastic-laminated posters cover Dhaka and loud campaigning runs late into the night, candidates promising a better city are asked how much they think about pollution.
This year's bird census at Tanguar Haor counted 51,368 migratory waterbirds, including rare and threatened species, and researchers expect numbers to rise sharply in February.
A businessman in Jhalakathi led a speedboat awareness campaign along about 20 kilometres of river to protect the migratory birds wintering on the Bishkhali's banks.
Along with bone-chilling cold, dense fog has cut visibility in Bangladesh to as little as 100 metres this winter, the Meteorological Department says.
The glossy ibis, a winter visitor to Bangladesh's wetlands, is declining because of indiscriminate hunting and the destruction of aquatic plants.
The peregrine falcon, a winter migrant, is the world's fastest animal, diving at 300-350km an hour to seize its prey.
Himalayan vultures that fly thousands of kilometres to Bangladesh each winter are being attacked and killed by people when they fall exhausted to the ground.
A great bittern, the rarest bird seen in Bangladesh, has been rescued in Sreemangal about 10 years after the last sighting.
The government has planted about 38 lakh palm saplings across Bangladesh to reduce the impact of lightning, the disaster management state minister said.
The oriental darter, once common across Bangladesh, has declined rapidly over three decades and is now endangered in the country.
Poachers are trapping and shooting migratory birds in wetlands across Satkhira in defiance of a government ban.
Flocks of migratory birds have again settled on the lakes of Jahangirnagar University, drawing visitors from Dhaka and elsewhere.
The government plans to acquire land around a mango orchard in Rajshahi's Bagha upazila to give a nesting colony of Asian openbills a permanent home.
