Outlook Not so Rosy for This Grosbeak and Other Migrants

Summary

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Old-timers often say that migration is not as good as it used to be -- that there seem to be fewer birds than in past years.

Such claims can be surprisingly difficult to confirm, since migration in any particular year varies because of many factors, including the local weather and the timing of birding efforts (more birds are seen if a large migration event happens on a weekend, when more birders are in the field). So it is often difficult to compare the number of migratory birds from year to year and determine if there has been any consistent change.

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Extract

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Outlook Not so Rosy for This Grosbeak and Other Migrants

In a recent paper in the scientific journal the Wilson Bulletin, Trevor Lloyd-Evans and Jonathan Atwood were able to overcome these problems by studying the birds captured and banded at the Manomet Center for Con...

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