Birders prepare for count mindful of mass die-offs

In this photo taken Friday, Feb. 11, 2011, Nancy Castillo watches birds at numerous feeding stations at her home in Providence, N.Y. Beginning on Feb. 18, she will be joining bird watchers across the United States and Canada in helping to create a snapshot of bird populations as part of the Great Backyard Bird Count. (AP Photo/Tim Roske)

In this photo taken Friday, Feb. 11, 2011, Nancy Castillo watches birds at numerous feeding stations at her home in Providence, N.Y. Beginning on Feb. 18, she will be joining bird watchers across the United States and Canada in helping to create a snapshot of bird populations as part of the Great Backyard Bird Count. (AP Photo/Tim Roske)

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