... attributed. Summary:   Vespula germanica and Vespula vulgaris have eyes of high spatial resolution that are well suited to their ecological needs. Insect vision Social hymenopteran Visual cues Visual field Visual acuity Interommatidial angle Vetenskapsrådet http://dx.doi.org...

... differences in motion detectability across species when the stimuli were conspicuous, suggesting differences in visual acuity in closely related species of jumping spiders. Furthermore, small stimuli elicited significantly lower responses than large stimuli across species and speeds. Our results thus suggest...

... =0.419). Fig. 4. Calculation of visual acuity of Conomurex luhuanus based on behaviour and morphological data, with depiction of acuity. (A) Response probabilities (black shapes) of C. luhuanus to expanding stimuli with visual angle of checkerboard background squares varied (below...

... attributed. Summary: The triggerfish Rhinecanthus aculeatus is an ideal species for behavioural investigations of visual processes. They express six opsin proteins in different photoreceptors, and their visual acuity is significantly better for achromatic than for chromatic stimuli. Behaviour...

..., Naso brevirostris , with the largest changes occurring from the larval to the juvenile stage. Visual ecology Teleosts Fish Ontogeny Opsin Retina Visual acuity Many animals use vision to perform important behavioural tasks such as feeding, mating, avoiding predators and finding...

... whether the animals oriented towards the stimulus. We found that D. africanum responds by taxis towards isoluminant stimuli with a spatial resolution in the range of 29–69 deg. This corresponds to a theoretical acceptance angle of 38–89 deg, assuming a contrast threshold of 10%. The visual acuity...

.... Visual modeling suggests this may reflect a trade-off between colour discrimination and contrast detection. Vision Retina Spectral sensitivity Visual acuity For animals in a broad range of environments, vision mediates diverse behaviours, including navigation, foraging, territorial...

... biomechanics in non-human vertebrates. The secondarily diurnal gecko, Rhoptropus afer , shows changes in speed and posture in low light conditions. Visual acuity Locomotion Performance Kinematics Vision Gekkonidae Desert Fog Stability Lizard Vision plays many critical roles in animal...

... take mobile prey, and black kites, Milvus migrans , which are primarily carrion eaters. We measured visual acuity, foveal characteristics and visual fields in both species. Visual acuity was determined using a behavioural training technique; foveal characteristics were determined using ultra-high...

... higher visual acuity, which may compensate for larger blind spots (i.e. pectens) above the center of acute vision, enhancing predator detection. Finally, species with a steeper change in ganglion cell density across the retina had higher eye movement amplitude, probably due to a more pronounced reduction...

... ° to one side to see the prey straight ahead with maximum visual acuity, yet turning the head would presumably slow their diving speed by increasing aerodynamic drag. This paper investigates the aerodynamic drag part of this paradox by measuring the drag and torque on wingless model bodies of a peregrine...