NEW DELHI: The National Zoological Park on Sunday documented 50 bird species and 13 spider and insect species during its citizen science walks, with participant. Twenty participants, including nature enthusiasts, students, wildlife photographers, researchers, interns, volunteers and other citizens, took part in the walks. The spider and insect walk was led by wildlife photographer Ashir Kumar, while ornithology expert Asani Bhaduri guided the bird walk, it said.