Phaeomyias murina incomta The northern mouse-colored tyrannulet (Nesotriccus incomtus) is a species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers.

[1] It is found in Colombia, Costa Rica, Ecuador, Guyana, Panama, Trinidad, Venezuela, and possibly Brazil, French Guiana, and Suriname.

The International Ornithological Committee (IOC) and the Clements taxonomy treat the northern and southern taxa as separate species.

Their wings are dusky with wide whitish to dull cinnamon edges on the innermost flight feathers and tips on the coverts.

Both sexes of both subspecies have a brown iris, a thick, rounded, horn-colored bill with pale pink at the base of the mandible, and gray legs and feet.

[1] Clements and Cornell University's Birds of the World add Suriname, French Guiana, and northern Brazil, where the IOC places the southern mouse-colored tyrannulet.

[1][2][4] Sources agree that it occurs in northern Colombia and all three ranges of the Colombian Andes and in most of Venezuela except southern Amazonas state.

[4][10][12] The northern mouse-colored tyrannulet inhabits a variety of open to semi-open landscapes, most of which are arid to only moderately humid.

As best is known, it primarily feeds on insects though fruits of mistletoe (Loranthaceae) and some other plants are a significant part of its diet.

The female alone builds the nest, an open cup of plant fibers and roots, grasses, mosses, and spider web with feathers in the structure and as a lining.

It is typically placed in a branch fork or tree crotch within about 4 m (13 ft) of the ground, though occasionally higher.

The northern mouse-colored tyrannulet's dawn song is "a long, energetic, almost bubbly tu-tu-tu-tu-tu...tu-tu-Tu-Te-Teep!"