These raptors are widespread in the Neotropics where they feed primarily on tree snails. Note broad paddle-shaped wings, pinched in at the base of the trailing edge. This species occurs in a bewildering array of plumages, gray males (seen here), rufous females, an all dark morph, and a whitish juvenile plumage. In addition, there are two different bill types, one large and one small, perhaps facilitating the partitioning of limited resources. However the large-billed type is quite rare and attempts to study their ecology in detail has been thwarted by the difficulty in finding places where they are easy to study. Even where common, this is a shy species, spending much time perched in the forest canopy. Canon PowerShot SX60 HS.
References:
Bierregaard, R.O., Jr, Kirwan, G.M. & Marks, J.S. (2019). Hook-billed Kite (Chondrohierax uncinatus). 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/52955 on 26 July 2019).
Global Raptor Information Network. 2019. Species account: Hook-billed Kite Chondrohierax uncinatus. Downloaded from http://www.globalraptors.org on 26 Jul. 2019
Hook-billed Kite (Chondrohierax uncinatus), 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/hobkit
Johnson, J.A., Thorstrom, R. & Mindell, D.P. (2007) Systematics and conservation of the Hook-billed Kite including the island taxa from Cuba and Grenada. Anim. Conserv. 10(3): 349–359.