This species typically forages low along river edges. Flycatchers in the genus Myiarchus are often tricky to identify and are best told apart by voice. Short-crested is further distinguished from the larger Swainson's Flycatcher by Short-crested's all dark bill, darker yellow underparts and lack of dark face mask. Dusky-capped Flycatcher is smaller with darker head and very different voice. This individual seems to have a slight "overbite" in which the hook at the tip of the bill is visible Canon PowerShot SX60 HS.
References:
Joseph, L. (2019). Short-crested Flycatcher (Myiarchus ferox). 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/57502 on 4 August 2019).
Schulenberg, T. S. & Stotz, D. F., Lane, D. F., O'Neill, J. P, Parker III, T. A. & Egg, A. B. (2010). Birds of Peru: Revised and Updated Edition. Princeton: Princeton University Press.
Short-crested Flycatcher (Myiarchus ferox), 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/shcfly1