- Herpsilochmus axillaris
11–12 cm (4¼-4¾ in)
- Black crown with white spots
- Whitish supercilium
- Mottled side of head
- Olive-yellow upperparts
There are 4 subspecies
- H. a. senex:
- Tropical and subtropical Western Andes of south-western Colombia
- H. a. aequatorialis:
- Eastern slope of Andes of south-eastern Colombia and eastern Ecuador
- H. a. puncticeps:
- Eastern slope of Andes of northern Peru (Loreto to Huánuco)
- H. a. axillaris:
- Eastern slope of Andes of southern Peru (Junín, Cusco and Puno)
Humid montane evergreen forests and forest edges, at heights around 800–1900 m.
Their diet consists almost entirely of insects, and probably spiders too. They are rarely seen alone, but usually in pairs and family groups.
They forage in pairs or family groups feeding on a variety of insects.
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2018. The eBird/Clements checklist of birds of the world: v2018. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
- Handbook of the Birds of the World Alive (retrieved January 2015 and March 2019)
- BirdForum Opus contributors. (2021) Yellow-breasted Antwren. In: BirdForum, the forum for wild birds and birding. Retrieved 23 June 2021 from https://www.birdforum.net/wiki/Yellow-breasted_Antwren