Chestnut-sided Warblers (Dendroica pensylvanica) and Blue-winged Warblers (Vermivora pinus) sing different song types in different contexts. Local dialects exist in the "Unaccented Ending" songs ...
American Robins (Turdus migratorius) displayed four classes of approach to a Screech Owl (Otus asio): silent approach, vocal approach, mobbing, and attacking. Mobbing and attacking were confined to ...
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