Raptor Population Index Project: 2011 Analysis
The 2011 RPI analysis effort includes a new set of population trend analyses containing information on 26 species of diurnal raptors, grouped into four regions. This analysis forms the foundation of a new assessment of the status of migratory birds of prey in North America. Fifty-three datasets were used, each consisting of 10 to 45 years of counts contributed by migration monitoring sites to HawkCount.org.
To view the 2011 RPI Analysis results, use the menu to the left, or click one of the following:
- Trend Graphs: View trend graphs by species and by location
- Trend Maps: View per-species trends on maps of North America
- Methodology: How to read the graphs and maps and a description of the methods used to calculate the population indices and trends
- Assessments: Regional population assessments by species