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 1925 1035 779 529 126 986 1.3 1.9
2013 2305 1522 1228 928 235 1831 1.5 2.0
2014 1773 1325 836 580 230 1102 1.3 1.9
2015 1331 1072 762 531 216 1014 1.3 1.9
2016 1309 1001 593 397 154 794 1.3 2.0
2017 992 799 499 303 162 590 1.2 1.9
2018 930 734 464 334 84 641 1.4 1.9