Raptor Population Index

What is the Raptor Population Index?

The Raptor Population Index (RPI) is a collaborative effort to understand and share trends and conservation status of migratory raptors in North America, continent-wide and regionally. Each year thousands of people gather on ridgelines, coastlines, and other concentration points across the globe to watch migrating raptors during the fall and spring. This awe inspiring event provides a fun and accessible point of entry to bird watching and in-flight identification to the public, while also generating decades of standardized monitoring data from sites across North America. These count data also have value for those interested in the status and conservation of raptors.

Hawkwatchers at Bonney Butte Hawkwatch in 2019

RPI uses data from partnering sites that submit their data to Hawkcount.org and also meet longevity and protocol requirements in a standard and robust way (for more see methodology). The RPI team analyzes data every three years. The 2019 update data represent 43,455 hours of observation and 8,897,955 migrants counted. Annual index values for each species at a count site are also available for use by the conservation community at large.

RPI launched in 2004 and partners include: the Hawk Migration Association of North America, HawkWatch International, Hawk Mountain Sanctuary Association, and Birds Canada.

Hawk Mountain Sanctuary

Hawk Migration Association
of North America

HawkWatch International

Birds Canada