This is an old record dated 12 July 2013 from the Black Sea, just off Cape Kaliakra, Bulgaria. Daniel Mitev has contacted an expert from Spain, Jose Manuel Arcos, who confirmed the ID of Balearic Shearwater (Puffinus mauretanicus). Below is a quote from his e-mail and a link to a paper dealing with the ID of three small Shearwaters in the Mediterranean.
“Really interesting observation!!! To me a Balearic shearwater. We see some intermediate birds hard to allocate, and we have a population with hybrid features breeding in Menorca, so some birds are tricky. However, your bird looks to me out of the “overlapping zone”, and matches a quite typical Balearic (dark and diffuse axillaries, broad dark flanks, extended dark undertail coverts/vent, dark in neck extending diffusely downwards, and apparently strong bill-the latter less obvious)”.
Article: Plumage variability and field identification of Manx, Yelkouan and Balearic Shearwaters
For this observation also take parts Minko Madjarov, Anna Staneva, Dimitar Dimitrov
© Daniel Mitev
© Dimitar Dimitrov
After that we vote Yes for the First record of Balearic Shearwater (Puffinus mauretanicus) for Bulgaria!