The Tapajos scythebill (Campylorhamphus probatus) is a species of bird in the subfamily Dendrocolaptinae of the ovenbird family Furnariidae.

[3] By the early 2010s BirdLife International's Handbook of the Birds of the World (HBW) had separated it as this species.

[4] In July 2023 the International Ornithological Committee (IOC) adopted the split and in October 2023 the Clements taxonomy followed suit.

Their underparts are dull brown with narrow buffy streaks with indistinct darker borders on the breast that don't continue onto the belly.

Their iris is dark brown to chestnut and their bill has a blackish maxilla and a paler mandible.

It greatly favors terra firme but occasionally occurs in floodplain and seasonally flooded forest.

It almost always forages as part of mixed-species feeding flocks and will occasionally follow army ant swarms.

The nominate Tapajos scythebill's song is "a rapid trill...often (not always) with [a] longer introductory note, 'wheee, di, di-di-di-di-di-di-di-di-di-di-di-di-di-dew' ".