Barn owl's performance in visual-search tasks. (A) The OwlCam is a wireless video camera that weighs 5.5 g in total and is designed for fixed mounting on the owl’s skull. (B) A barn owl with a mounted OwlCam. The camera enables a frontal view from the owl's point of view, which, with processing, can identify the items the owl fixated on during search or other visual tasks. (C) An example of panoramic scene reconstructions of OwlCam videos and scan paths (dash lines) and fixation spots locations (circles) up to the first fixation on the target (blue disk) during an orientation task. The numbers near the circles indicate the fixation number. The stimulus arrays contain (from left to right) 16, 36, and 64 items. Note that the number of saccades stayed relatively constant despite the change in set size, indicating that the orientation feature elicited pop out in the barn owl. (D) Serial searches are characterized by a relatively large number of saccades until the target is found. This example depicts the scan path during a conjunction search task for a target with a particular contrast and orientation (shown in inset e2). In this case, the target was detected at fixation number 10. (E) A conjunction task combining high contrast and orientation elicited serial search and was characterized by a linear increase in both the number of saccades and the search time (until target detection) as a function of set size (the two solid lines, representing the two barn owls' performance). The dots are the average over all trials per condition and the error bars denote the standard error of the mean. For comparison, the dashed lines represent high luminance-contrast feature task results that elicited pop out in the same owls. A and B images are adapted from Harmening et al. (2011), C from Orlowski et al. (2015), and D and E from Orlowski et al. (2018).