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Desert Wheatear Oenanthe deserti. When high pressure builds over Scandinavia in the autumn, a strong easterly flow of air usually floods across Europe and brings with it a scattering of unusual passerine birds from as far away as Siberia or central Asia. Typically records relate to juveniles whose migratory instincts have failed them. Easterly winds continue to bring unusual sighting right through to the start of winter. Just when it seems that autumn migration has finished, a spell of easterly winds in November will sometimes bring a surprise in the form of a Desert Wheatear Oenanthe deserti, which by rights should be spending the winter in Africa, the Middle East or south Asia.