Great Blue Heron (Ardea herodias) Science Article 1
Seventeen Great Blue Heronries were surveyed in nine counties of northeast Ohio during the1993 breeding season to determine nest site characteristics. Herons nested in 15 species of deciduoustrees, selecting the taller trees at each site. Crown integrity was not a requisite for tree usage; repaired(reoccupied) nests and new colonies were established in dead trees as well as in healthy ones.
BECKY A. CARLSON and John Carroll, OHIO J. SCI. 95 (5): 312-315, 1995