Many marsupial species are crepuscular or nocturnal, meaning they are most active during twilight or night hours. Large eyes are an adaptation that enhances vision in low-light conditions. The increased surface area of a large eye allows for more light to enter, stimulating more photoreceptor cells in the retina. This increased light sensitivity enables these animals to navigate, forage, and detect predators more effectively in darkness or dim light. The size and placement of the eyes also contribute to a wider field of view, which is beneficial for detecting potential threats.
Enhanced night vision provides a significant survival advantage for nocturnal animals. It allows them to exploit resources unavailable to diurnal (day-active) competitors and avoid predators that primarily hunt during the day. This adaptation has been crucial in the evolutionary success of many marsupial species, particularly in habitats with limited daytime resources or high diurnal predator pressure. The evolution of nocturnal vision has played a significant role in shaping ecological communities and biodiversity.