Yellow-browed Warbler (Phylloscopus inornatus) breeds across the eastern Palearctic and primarily winters in Northeast India, Bangladesh and Southeast Asia. It also regularly winters around hill tops in South India.
It also migrates through Western Europe along the North Sea, where it was once very rare but now is a regular passage migrant. It is unclear what happens to the birds that migrate down this western route and many questions remain about this phenomenon. Do they survive to return to their breeding grounds? Do they go back after spending the winter in northwestern Africa and the Canary Islands? Or do they go elsewhere?