Slightly fluffed up from preening, this photo shows the distinct line down the middle of the throat which helps distinguish this species. Juveniles such as this are white below with variable amounts of dusky streaking. This is a variant in which its underparts are almost unmarked. Adults have variable amounts of rust color on their underparts. This is a rather rare species and we only saw it once on our visit to the Amazon. They reportedly follow troops of monkeys to capture small lizards and insects disturbed in the forest canopy. A distinctive double notches on the cutting edge of the maxilla gives the Double-toothed Kite its name. Two subspecies are recognized of which this is the nominate race found in tropical South America. Canon PowerShot SX60 HS.
References:
Bierregaard, R.O., Jr, Marks, J.S. & Kirwan, G.M. (2019). Double-toothed Kite (Harpagus bidentatus). 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/52973 on 31 July 2019)
Double-toothed Kite (Harpagus bidentatus), 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/dotkit1
Global Raptor Information Network. 2019. Species account: Double-toothed Kite Harpagus bidentatus. Downloaded from http://www.globalraptors.org on 30 Jul. 2019