Azure-Winged Magpies Avoid Nest Predation by Nesting near a Japanese Lesser Sparrowhawk's Nest

Abstract

Nest site selection of Azure-winged Magpies (Cyanopica cyana) was studied in relation to their proximity to the nests of Japanese Lesser Sparrowhawks (Accipiter gularis). Magpies used nest sites that were more concealed when not nesting in association with the hawk, and nests with a higher rate of leaf cover were less frequently depredated. Magpies preferred to nest close to hawk nests, and such sites had higher breeding success. However, Azure-winged Magpies nested in places with less leaf cover near hawk nests. Despite the lack of cover, the magpie nests were more successful when located near a hawk nest. Magpies effectively avoid nest predation by exploiting the defending behavior of the hawks.