Hearing the song of a yellow-rumped warbler or an olive-sided flycatcher during the early morning hours is a sure sign that spring has arrived. Many bird enthusiasts look forward to the annual return of birds we associate with the end of winter. The majority of the bird species that spend the spring and summer in the forests and woodlands of the Pacific Northwest are classified as Neotropical migrants (see the Glossary for technical terms). These birds spend the winter months in the Neotropics, which includes Mexico, Central and South Americas, tropical North America, and the Caribbean Islands.
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