This uncommon species is named for the vertical black marks (letters) along the cutting edge of the maxilla. However this individual has those marks faint or absent suggesting that it is an immature. The black face and head are seen on males at all ages. Females have a chestnut face and head. The dark lower mandible is characteristic of the distinctive subspecies P. i. humboldti which is sometimes treated as a subspecies of the Green Aracari or split as a separate species. Canon PowerShot SX60 HS.
References:
Shick, J. (2014). Lettered Aracari (Pteroglossus inscriptus), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.letara1.01
Short, L.L. & Kirwan, G.M. (2019). Lettered Araçari (Pteroglossus inscriptus). 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/56088 on 29 July 2019).