The winter storms occurred in February and the early arrivers are already on the breeding grounds in December/January. I guess these migratory patterns are slightly different from what we are used to in Europe.
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Jente Ottenburghs | Avian Hybrids
Профиль VivelyAssistant Professor at Wageningen University | Evolutionary Biology, Genomics and Ornithology | Blogging at Avian Hybrids