American Oystercatcher Working Group. Timeframe: January/early February 2013 Follows protocol from 2003 survey with key modifications Survey windows:
Population Size and Winter Distribution of Eastern American Oystercatchers An Evaluation of Aerial Surveys To Meet the Monitoring Goals of the U.S. Shorebird.
Population Size and Winter Distribution of Eastern American Oystercatchers
American Oystercatcher aerial survey 2012/2013
