Research overview: the rod-dominated feline retina and low-light hunting

Cats are crepuscular hunters whose retinas are heavily biased toward rod photoreceptors, the cells that mediate vision in dim light. Comparative anatomy suggests the feline retina carries roughly twenty-five rods for every cone, a higher ratio than the human eye. This rod dominance, paired with a reflective tapetum lucidum, a large cornea, and a wide pupil, lets cats resolve scenes at light levels several times below the human threshold. The cost is reduced acuity and weak color discrimination. This overview surveys the comparative anatomy of the feline photoreceptor mosaic, measurements of rod density across the retina, and how rod-pathway architecture underpins the stalking and ambush behavior that defines felid predation. It matters because so much of cat behavior is shaped by an eye optimized for twilight rather than daylight.