We only encountered a few of these solidly built pigeons, mostly singly or in pairs flying over the canopy. It is similar to Ruddy and Plumbeous pigeons, but both of those species have a darker, more uniform plumage, and prefer intact forests rather than river edges. Peruvian Pigeon (Patagioenas oenops) is similar but has a bicolored bill and pale eyes. Five to seven subspecies usually recognized with birds from the western Amazon assigned P. c. sylvestris. This race ranges from eastern Peru and Brazil, south of the Amazon, to Paraguay, northern Argentina and Uruguay. It is described as similar to nominate cayennensis, but with stronger tail banding contrasting with paler tail tip contrasting with an indistinct black subterminal band. Formerly this species went under the name Columba rufina. Canon PowerShot SX60 HS.
References:
Baptista, L.F., Trail, P.W., Horblit, H.M. & Boesman, P. (2019). Pale-vented Pigeon (Patagioenas cayennensis). 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/54135 on 27 June 2019).
Chalkowski, K. (2013). Pale-vented Pigeon (Patagioenas cayennensis), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.pavpig2.01