GOLDEN EAGLE DEMOGRAPHICS AND HABITAT USE ON A CALIFORNIA CENTRAL COAST LANDSCAPE

Bobby Kamansky; Center for Natural Lands Management; bkamansky@cnlm.org;

Golden eagles (Aquila chrysaetos) are one of the largest raptors in North America. They require small mammal populations and consistent nesting substrates. They are a fully protected species in California and a species conservation interest at the continental level. Recent studies provide some understanding of survey methods and eagle density in California. But little is known about population fluctuations, demographics and, gaps exist in knowledge about nesting territory preferences and sizes. To understand eagle demographics, population, nesting and foraging preferences, I conducted eagle surveys during the breeding season on three routes (2019-2024) and baited seven stations with wild pig carcasses (2022-2024). I observed three nesting territories, 14 individual eagles and 9 immature eagles utilized 14,000 acres of central Coast Range blue oak woodland and serpentine grassland. Most eagle foraging was observed in open grasslands of 2,000 acres or more. Nesting occurred in large oak trees on steep slopes – except one nest in a Valley oak tree in a deep canyon. Young eagles dominate the population after breeding season and compete for carrion at carcasses. The population of six breeding adults and 8-10 immature eagles appears to be relatively stable, but environmental factors such as drought and cold/snow limited nesting.

Raptor Population Status and Ecology