Hi, Matt, there are many birding spots in and around New Delhi. First one is Sultanpur Bird Sanctuary, Chandu, Haryana, which is nearest to IGI airport, New Delhi. Second is Okhla Bird Sanctuary at Delhi-Noida border. Third is Surajpur Bird Sanctuary in Greater Noida, Gautam Budh Nagar, which is farthest from IGI Airport, New Delhi. All three are proper bird sanctuary. Besides these, there are some bird specific birding spots around New Delhi, which should be visited with local expert bird guide like Bondsi, near BSF camp, Sohna, Haryana for Indian Pitta, Indian pacific flycatcher. Mangar bani, Haryana for Indian Pitta. Dhanauri wetland for Sarus Crane, Bristled Grassbird, Yellow Bittern, Chinnamon Bittern etc.