Summary Statistics

Raptor biologists assess the health of osprey populations by looking at several reproductive parameters. The table below is a live calculation based on activity data entered by Osprey Watch volunteers. Reproductive rates from 0.8 to 1.2 are minimum values to sustain a population. The higher these values are the healthier the osprey population. These rates vary based on age-to-first-reproduction, survivorship rates, and many other factors.

Total Number of Nests Number of Occupied Territories Number of Active Nests Number of Successful Nests Number of Failed Nests Number of Young Produced Number of Young Produced per Active Nests Number of Young Produced per Successful Nests
2012 1929 1039 782 530 126 988 1.3 1.9
2013 2303 1514 1222 922 232 1820 1.5 2.0
2014 1758 1309 820 568 226 1073 1.3 1.9
2015 1310 1049 741 518 208 988 1.3 1.9
2016 1314 1002 594 397 154 794 1.3 2.0
2017 997 800 500 305 159 596 1.2 2.0
2018 764 731 339 220 59 451 1.3 2.1