#peucedramidae

Olive Warbler (Peucedramus taeniatus), family Peucedramidae, order Passeriformes, Mt. Lemmon, AZ, USA

This bird is neither olive, nor is it a warbler.

The Olive Warbler was placed in the wood warbler family Parulidae, but was later moved into its own family, due to genetic data.

Olive Warblers are more closely related to finches and sparrows.

Olive Warbler (Peucedramus taeniatus), family Peucedramidae, order Passeriformes, found in much of Mexico and in AZ and NM in the United States.

This bird is neither olive, nor is it a warbler.

The Olive Warbler was placed in the wood warbler family Parulidae, but was later moved into its own family, due to genetic data.

Olive Warblers are more closely related to finches and sparrows.

Olive Warbler (Peucedramus taeniatus), family Peucedramidae, order Passeriformes, found in much of Mexico and in AZ and NM in the United States.

This bird is neither olive, nor is it a warbler.

The Olive Warbler was placed in the wood warbler family Parulidae, but was later placed into its own family, due to genetic data.

Olive Warblers are more closely related to finches and sparrows.

Olive Warbler (Peucedramus taeniatus), family Peucedramidae, order Passeriformes, Chiricahua Mountains, AZ, USA

This bird was placed in the wood warbler family Parulidae, but was placed into its own family, due to genetic data.

White-winged Warbler (Xenoligea montana)

IUCN Rating: Vulnerable

Range: resident; montane regions of Hispaniola

Habitat: pine forests, especially above 1300m, as well as humid broadleaf forests with a dense understory

Subspecies: none

Olive Warbler (Peucedramus taeniatus)

IUCN Rating: Least Concern

Range: semi-migratory; breeds from southern Arizona and New Mexico down to northern Nicaragua. The northern population (AZ, NM, Sinaloa, Nuevo Leon) move south for winter.

Habitat: prefers open forests heavy with pine, fir and an understory with oak.

Subspecies: 5

Olive Warbler (Ron Knight)

A bit of a confusing outlier, the Olive Warbler was placed originally in Parulidae until 1998, although there were multiple papers arguing for the species to be split out as early as 1962. And it seems for good reason! While I won't copy-quote or even try to summarize every little difference between wood warblers and the Olive Warbler, a huge reason is the fact that Peucedramus has 10 primary feathers while Parulidae only has 9. Even though their 10th feather is reduced in size, it's still an entire extra feather, and that trait alone splits a lot of birds into differing families. You don't randomly have an extra feather, you know?