Bald Eagle Incursions and Predation at Great Blue Heron Colonies
- 1 January 1989
- journal article
- research article
- Published by JSTOR in Colonial Waterbirds
- Vol. 12 (2) , 215-217
- https://doi.org/10.2307/1521343
Abstract
We recorded Bald Eagle (Haliaeetus leucocephalus) incursions at eight Great Blue Heron (Ardea herodias) colonies in the Pacific Northwest in 1988. The incursion rate was one per 10.3 hours of observation. Herons showed three acoustic responses to eagle intrusions: sudden silence, roaring, and no change. Two incursions resulted in predation of heron chicks. We suspect that eagle predation is more frequent than what we observed and could adversely affect heron productivity in some colonies.This publication has 0 references indexed in Scilit: