India, June 30 -- The summer survey of the Delhi Bird Atlas concluded on Sunday with more than 160 species recorded across seven clusters and 145 one-sqkm subcells, officials from Delhi's forest and wildlife department said. At least 21 of these species were new ones not recorded in the winter survey, held between January 1 and the first week of February in which 200 species were recorded.

A preliminary report on the findings of both surveys will be released in October during Wildlife Week, the forest department said on Sunday. The Delhi Bird Atlas will be a detailed book on the Capital's bird diversity in terms of species and distribution and is planned to be released towards the end of next year after two more surveys.

"If we combine ...