Abstract
A pair of Eurasian Wrynecks Jynx torquilla were observed breeding from June to July, 2012 in Hirosaki City of Aomori Prefecture, northern Japan. We recorded their feeding activity, using time-lapse photography (15 second interval), with a 300mm single-lens reflex camera. The auto-focus feature was not serviceable during low illumination or strong wind. Photographs were recorded from the hatching date on June 21, to the fledging date on July 13. During the latter brooding period, the number of photos showing feeding of the nestlings decreased. However, the number of photos showing warning behavior by Eurasian Wrynecks increased. The wrynecks were apparently wary of Chestnut-cheeked Starlings Sturnus philippensis, which are potential predators of wryneck chicks. During the first few days after hatching, the wryneck parents brought nestlings only ant cocoons, but after that initial period the adults also fed them adults and eggs of ants. The amount of food increased during the early and middle periods of the nestling phase, but then leveled off during the remainder of the nestling phase.
