Eyeshine is a phenomenon where the eyes of certain animals appear to glow in low light conditions. This effect is primarily due to a layer of tissue called the tapetum lucidum, which reflects light that passes through the retina back into the eye. This reflection enhances the animal's ability to see in the dark, making it particularly useful for nocturnal creatures like cats and deer. The color of eyeshine can vary depending on the species and the angle of light. Common colors include green, yellow, and blue. Eyeshine is often observed in wildlife during nighttime or in dimly lit environments, providing a glimpse into the adaptations that help these animals thrive in their habitats.