Kusheshwar Asthan Bird Sanctuary is situated 45 kms from Darbhanga and is a one of the most prominent nature parks in the region.

Bird watching is major attraction of this sanctuary. The sanctuary consists of 14 villages which comes under Kusheshwar Asthan block in Darbhanga. It is spread over about 7019. 7 acres and these 14 villages have been declared as Kusheshwar Asthan Bird Sanctuary under Wildlife Protection Act 1972. Kusheshwar Asthan Bird Sanctuary was notified in 1994.

These villages remain waterlogged most of the times. These wetlands are home in winters to at least 15 endangered species of migratory birds from places as far as Mongolia and Siberia. Tourists can spot Dalmatian Pelican, Indian Darter, Bar-headed goose, Siberian Crane and many more unique birds between the months of November - March. The name of this place is derived from Kusheshwar Shiva Temple which lies nearby the sanctuary.

Studies indicates that these wetlands are rich in nutrient for biological activities and are sufficient to support the biodiversity, but few locations are influenced by anthropogenic activities which cause the increase of sulphur, chloride, iron and lead. It also indicates rock weathering is a major source of ions in these wetlands, particularly the dissolution of carbonate minerals. The hydrogeochemistry of water in Kusheshwar-Asthan is favouring kaolinite formation and Quartz, clay minerals and chlorite are the dominant minerals in the wetlands.

Tourists can find several rare species of birds in this sanctuary. Aside from neighbourhood and Indian flying creatures, quantities of transitory feathered creatures from various nations can be found here in the winter season. Beacuse of this manner, it is sometimes called Winter Capital of those migratory birds. Apart from beautiful birds, picturesque natural view of this sanctuary mesmerizes visitors with its serene beauty. This Kusheshwar Asthan Bird Sanctuary is one of the highest vacationer goals in Darbhanga locale.

Nakta, Lalshar, Mail, Dighouch, Gagan, Gairi, Chaha, Karan, Silli, Harial, Adhani, Ratwa, Gaiber(White and Black) are some famous species of birds seen here. Some territorial birds such as Pied Kingfisher, Great Egret, Indian pond heron and Little cormorant can also be sighted here. Kusheshwar Asthan Bird Sanctuary can be visited during timings 8:00 AM - 7:00 PM.