Slaty-backed Nightingale-Thrush Catharus fuscater

Slaty-backed Nightingale-Thrush inhabits humid montane forests from Costa Rica to central Bolivia, but it is poorly known throughout its range because of its retiring nature and penchant for dense forest undergrowth. Variation in plumage is subtle throughout the species range, but overall the bird is dark slaty gray (sometimes with a brown or olive tint) with a conspicuous white iris, and bright orange bill and orbital ring. "It is at all times an extremely shy bird, never venturing out of the dark forest, where it keeps close to the ground, slipping away like a shadow when approached" (Todd and Carriker 1922).