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 782 529 126 987 1.3 1.9
2013 2304 1515 1221 921 235 1818 1.5 2.0
2014 1761 1310 818 566 227 1069 1.3 1.9
2015 1309 1048 740 517 209 988 1.3 1.9
2016 1296 982 573 381 149 764 1.3 2.0
2017 182 147 52 2 16 6 0.1 3.0