SREEJITH, P. P., C. PRASAD, K. R. NATH, S. SURESH, N. LEEMON, and S. NAJEEB. “QUALITATIVE PATTERNS OF MORPHOLOGICAL CHARACTERIZATION IN THE FEATHERS OF FLYING AND FLIGHTLESS BIRDS”. UTTAR PRADESH JOURNAL OF ZOOLOGY, vol. 41, no. 18, Nov. 2020, pp. 1-12, https://mbimph.com/index.php/UPJOZ/article/view/1713.