The taxonomy and identification of the Band-rumped Storm-petrel Hydrobates castro/monteiroi/jabejabe complex is very, well, complex, as are their previous occurrences in Britain.

An extremely rare hybrid duck has been documented in Russia. The bird, a male Red-breasted Merganser × Smew, was seen along the Kamchatka coastline in the winters of 2023 and 2024, as reported by Ornithomedia. The hybrid was found among Red-breasted Mergansers at Avacha Bay in February and March 20...

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Caspian Gulls (Larus cachinnans) have expanded their breeding range over around 2500 km westward, from the Black Sea to Western Europe, within decades. As a colonising species, it invaded a region wit...