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- Curruca althaea
Dark top of the head and brown back.
No subspecies are currently recognized by most authors. From the Balkans to the Caucasus Mountains however, Sylvia curruca caucasica occurs which is intermediate between the Lesser Whitethroat and Hume's Whitethroats (Snow et al. 1998). It is presently not clear whether the eastern part of this population is correctly assigned to the European species, or consists of hybrids in a contact zone.
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, S. M. Billerman, T. A. Fredericks, J. A. Gerbracht, D. Lepage, B. L. Sullivan, and C. L. Wood. 2021. The eBird/Clements checklist of Birds of the World: v2021. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/
- BirdForum Opus contributors. (2023) Hume's Whitethroat. In: BirdForum, the forum for wild birds and birding. Retrieved 28 November 2023 from https://www.birdforum.net/opus/Hume%27s_Whitethroat
GSearch checked for 2020 platform.