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 1930 1039 782 530 126 989 1.3 1.9
2013 2306 1517 1222 922 235 1820 1.5 2.0
2014 1762 1311 819 567 227 1072 1.3 1.9
2015 1311 1049 741 518 209 988 1.3 1.9
2016 1317 1003 594 396 155 792 1.3 2.0
2017 1008 945 491 288 152 565 1.2 2.0