^ Hoatzin, New World vultures, Secretarybird, raptors , Gill F, D Donsker & P Rasmussen (Eds). 2020. IOC World Bird List (v10.1). https://doi.org/10.14344/IOC.ML.10.1 . (Downloaded 26 May 2020) ^ BirdLife International. 2019. Pandion haliaetus (amended version of 2016 assessment). The IUCN Red List ...