... the retina contains more cell types than those of other gastropods. Stromboidea Conch snail Neuroethology Contrast sensitivity Visual acuity Comparative morphology Natural Environment Research Council http://dx.doi.org/10.13039/501100000270 NE/L002434/1 University of Bristol...

... 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...

... light sensitivity. Detailed examination of the retinal ganglion cell layer in order to determine ganglion cell densities, coupled with focal length estimates, will provide measures of visual acuity across geckos that vary in their diel activity pattern. Anthony Russell and Clint Collins assisted...

... 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...