Retinal ganglion cell distribution and visual acuity in alpacas (Vicugna pacos)
Vision reflects the visual demand for environmental adaptation of an animal and also implies the biological niche of a species. Retinal specializations, such as visual streaks, areae centrales and foveae, have been found in animals and the function of each retinal specialization is correlated to its visual needs. Harman et al analyzed retinal ganglion cell (RGC) topography of dromedary camels and found a vertical steak which is unusual for ungulates. A vertical steak had only been reported in two-toed sloths. Because alpacas are closely related to dromedary camels in the same taxonomic family, ...
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