Abstract
The foraging behavior and habitat use of dark morphs of the Pacific Reef Heron Egretta sacra were investigated along rocky coasts in central Japan. A behavior in which individuals crouch with their wings spread outward while ambushing prey was defined as the "crouch with outstretched wings". Pacific reef herons foraged in a variety of ways across different habitats, mainly along rocky coasts. They often used ambush foraging in deeper and either walked while foraging or used ambush foraging in shallow water. They also searched for prey in flight and caught it by plunging their bills into the water. The "crouch with outstretched wings" behavior was often observed when waves were approaching. This behavior may play a role in maintaining posture and stability under wave action on rocky shores.
