The survey, carried out from January 22 to 25 by the State Forest department with support from the Society for Tropical Ecology and Research (STEAR), Nilambur, and the Travancore Natural History Society (TNHS), Thiruvananthapuram, documented 171 bird species, 177 species of butterflies, and 42 species of odonates, with several recorded in the sanctuary for the first time.
