Note the bright red cere and lores. This uncommon raptor is a "sit-and-wait" predator easily overlooked when concealed on a perch within the forest. Ranging widely through secluded backwaters of the Amazon and Orinoco basins, its nest remains completely unknown. This species resembles the Plumbeous Hawk (Cryptoleucopteryx plumbea) which replaces it west of the Andes. In the past both were placed in the genus Leucopternis and sometimes lumped together as one species. However, despite their similarity the two are apparently not closely related and are now classified in different genera. Canon PowerShot SX60 HS.
References:
Amaral, F.S.R., Miller, M.J., Silveira, L.F., Bermingham, E. & Wajntal, A. (2006) Polyphyly of the hawk genera Leucopternis and Buteogallus (Aves, Accipitridae): multiple habitat shifts during the Neotropical buteonine diversification. BMC Evolutionary Biology 6(10): 1–21.
Bierregaard, R.O., Jr, Boesman, P. & Marks, J.S. (2019). Slate-colored Hawk (Buteogallus schistaceus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/53101 on 22 July 2019).
Global Raptor Information Network. 2019. Species account: Slate-colored Hawk Buteogallus schistaceus. Downloaded from http://www.globalraptors.org on 22 Jul. 2019
Slate-colored Hawk (Buteogallus schistaceus), In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. retrieved from Neotropical Birds Online: https://neotropical.birds.cornell.edu/Species-Account/nb/species/slchaw2