Songbirds from Marin County wintered in Mexico, flying 1,500 miles in a migration that was tracked by scientists.
The Marin Independent Journal reports researchers from Point Blue Conservation Science in Bolinas attached small tags called geolocators to 35 Swainson's thrushes before they flew south for the winter in 2010.
When the thrushes returned the following two springs, 12 tagged birds were recaptured, the tags were removed and the data was analyzed.
Researchers determined all 12 spent the winter in southern Mexico, near the border with Guatemala. Previously scientists could only guess at the birds' exact destination.
Researchers say the findings could help better protect the birds as their lifecycle and travels are better understood.
The newspaper says Swainson's thrushes have lost 95 percent of available nesting habitat throughout California because of climate change.
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