Ranging in Peru only along the upper Amazon and tributaries, these vultures could easily be confused with the more common Turkey Vulture or less common Greater Yellow-headed Vulture. This photo shows the distinctive bluish-gray crown and yellow-orange neck skin compared to the red skin of the Turkey Vulture. Lesser prefers river edges and tends not to soar as high as the other species. Two subspecies are recognized with birds in this area belonging to the larger C. b. urubutinga. Canon PowerShot SX60 HS.
References:
Eitniear, J. C. (2014). Lesser Yellow-headed Vulture (Cathartes burrovianus), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.lyhvul1.01
Global Raptor Information Network. 2019. Species account: Lesser Yellow-headed Vulture Cathartes burrovianus. Downloaded from http://www.globalraptors.org on 30 Jul. 2019
Houston, D., Kirwan, G.M., Boesman, P. & Marks, J.S. (2019). Lesser Yellow-headed Vulture (Cathartes burrovianus). 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/52941 on 31 July 2019).