If a birder identifies a bird matching the Potoo/Frogmouth description in the Amazon basin, which bird must it be?

Answer

A Potoo

Location serves as the single most reliable immediate differentiator; Potoos are strictly found in Central and South America (New World), meaning an observation in the Amazon basin must be a Potoo, as Frogmouths do not occur there.

If a birder identifies a bird matching the Potoo/Frogmouth description in the Amazon basin, which bird must it be?
taxonomybirdrelationFrogmouthpotoo