Bangladesh boasts a remarkably diverse avian population, with estimates suggesting around 718 species of birds have been recorded in the country. This rich biodiversity is a result of its varied habitats, ranging from lush forests and wetlands to coastal areas. These birds can be broadly categorized into resident and migratory species, each contributing to the vibrant ecosystem.

Resident Birds: Many bird species call Bangladesh home year-round. These residents are well-adapted to the local climate and environment. Some of the commonly sighted resident birds include the Oriental Magpie-Robin (Doyel), which holds the distinction of being the national bird of Bangladesh. Other familiar residents are various species of sparrows, crows, mynas, bulbuls, kingfishers, woodpeckers, and pigeons.

Winged Visitors: Migratory Birds: Bangladesh serves as a crucial wintering ground for a vast number of migratory birds that escape the harsh cold of the northern regions. These seasonal visitors typically arrive in October and depart by late March. The country's numerous haors, baors, chars, and coastal areas provide ideal feeding and resting spots for these birds. Notable migratory species include various types of ducks, geese, waders, shorebirds, and birds of prey. Popular destinations for these migratory flocks include Tanguar Haor, Hakaluki Haor, and Sonadia Island.

Common and Notable Species: Beyond the national bird, several other species are frequently encountered. The House Crow, Common Myna, Red-vented Bulbul, and Black Drongo are ubiquitous in both urban and rural landscapes.

Bangladesh is also a refuge for several globally threatened and notable bird species. While specific data on all endangered species requires more in-depth ornithological resources, some notable species that attract birdwatchers and conservation attention include the Masked Finfoot, Spoon-billed Sandpiper, Pallas's Fish Eagle, and various species of vultures, whose populations have seen drastic declines.

Important Bird Areas (IBAs): Several locations across Bangladesh have been identified as Important Bird Areas by organizations like BirdLife International. These sites are critical for the survival of bird populations, providing breeding, feeding, and roosting grounds. Key IBAs include:

• The Sundarbans: The world's largest mangrove forest is a vital habitat for numerous bird species, including the Brown-winged Kingfisher and the Mangrove Pitta.
• Tanguar Haor: This vast wetland in northeastern Bangladesh is a Ramsar site and a crucial wintering ground for hundreds of thousands of migratory waterbirds.
• Hakaluki Haor: Another significant wetland ecosystem that supports a high diversity of resident and migratory birds.
• Sonadia Island: Located off the coast of Cox's Bazar, this island is an important stopover for migratory shorebirds, including the critically endangered Spoon-billed Sandpiper.
• Various national parks and wildlife sanctuaries across the country also serve as important havens for avian fauna.

Conservation Challenges and Efforts: Despite the rich diversity, bird populations in Bangladesh face numerous threats. Habitat loss and degradation due to deforestation, agricultural expansion, and infrastructure development are major concerns. Pollution, climate change impacts (such as sea-level rise and increased salinity), and illegal hunting and trapping also pose significant risks.