# Phylloscopus borealis borealis

> subspecies of leaf warbler

**Wikidata**: [Q27624881](https://www.wikidata.org/wiki/Q27624881)  
**Source**: https://4ort.xyz/entity/phylloscopus-borealis-borealis


## References

1. IOC World Bird List Version 6.3
2. IOC World Bird List Version 7.2
3. IOC World Bird List Version 6.4
4. IOC World Bird List Version 7.1
5. IOC World Bird List Version 7.3
6. IOC World Bird List Version 8.1
7. Clements Checklist of Birds of the World
8. Taxonomy database of the U.S. National Center for Biotechnology Information
9. Integrated Taxonomic Information System
10. Global Biodiversity Information Facility
11. Catalogue of Life in Taiwan
12. UMLS 2023