Over the course of time, the record of the floral and faunal diversity, water quality, and habitat preference of avifauna sets a remarkable example of a complete wetland fulfilling all its characteristics with its unique flora and fauna including heronry of birds. Interventions like creation of bunds around the wetland to ensure water stays even during the winters have been implemented, with positive results like increase in number of migratory birds, plants as well as butterflies.
Surajpur wetland represents the mosaic of habitats supporting diverse threatened flora and fauna which forms an ideal indicator of measure of biodiversity. The wetland supports remarkable heronry of birds like Asian Openbill Stork, White-necked Stork, Black-crowned Night Heron and Black-headed Ibis.
Significantly, the wetland also supports the breeding of some rare birds like Bristled Grassbird, Black-necked Stork and Sarus Crane in Delhi NCR.
186 species of birds belonging to 44 families, of these 102 species are resident, 53 species are winter migrant, 28 species are summer migrant and 3 species are passage migrant. The occurrence of birds recorded as, 61 species are abundant, 71 species are common and 47 species are uncommon.
According to IUCN Red list criteria, 10 species of birds are threatened with extinction which is categorized into Endangered (EN) by one species; Vulnerable (VU) by 3 species and 6 species are Near Threatened (NT) respectively.
Apart from large population of avifauna, the wetland also supports six species of mammals includes Nilgai, Indian Grey Mongoose, Indian Hare, Golden Jackal and Five-striped Squirrel, 15 species of fishes, 11 species of herpeto-fauna, 52 species of butterflies and More than 220 species of plants recorded including 155 species of herbs, 11 species of shrubs, 36 species of trees and 18 species of herbaceous climbers.(Reference: WWF India Technical Report 2012-2013).