Irruptive Bird Survey Irruptive Bird Survey 1999-2000
'Common as they are now, and were winter before last, I saw none last winter.' Henry David Thoureau writing on Common Redpolls March 5 1853

The Irruptive Bird Survey has now closed for the season. We appreciate your reports and hope that you will participate in other BirdSource projects.

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National Audubon Society Cornell Lab of Ornithology
What is an "Irruption?"
ID Guide
Count Instructions
 
Irruptive Bird Survey Results
BirdSource
What is an \'Irruption?\' Irruptive Bird Species Identification Guide Irruptive Bird Survey Instructions