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 1931 1040 783 531 126 990 1.3 1.9
2013 2307 1518 1223 922 235 1820 1.5 2.0
2014 1763 1312 820 568 227 1073 1.3 1.9
2015 1312 1050 742 518 209 988 1.3 1.9
2016 1317 1005 596 398 155 796 1.3 2.0
2017 996 799 500 304 158 594 1.2 2.0
2018 636 612 206 29 22 66 0.3 2.3