Approximately bi-weekly surveys were carried out. Key Qualifications of the Observer: (1) accurate species identifications during every survey (2) committed to bi-weekly surveys lasting one hour each
Sampled on similar weather days across the study period restricted to local flight season (May-September). Surveys ended when snow covered the ground. Each survey lasted one hour with duration and starting time fairly consistent (but adjusted for local conditions). Sampled during peak flight activity (in general between 10:00AM and 5:00PM). Carefully recorded species sightings in 10 minute increments (0-10, 10-20, 20-30, 30-40, 40-50, 50-60) during every survey. We made observations in a consistent manner during surveys and throughout the study period (walked the same route during each survey).