TY - RPRT TI - Drone-based effective counting and ageing of hippopotamus (Hippopotamus amphibius) in the Okavango Delta in Botswana AU - Inman, V. AU - Kingsford, R. T. AU - Leggett, K. E. AU - Chase, M. J. PY - 2019 DO - 10.1101/689059 UR - https://www.biorxiv.org/content/10.1101/689059v1 ID - 10.1101/689059 ER -