Nocturnal animals have larger pupils to absorb more light to enable nominal vision in dark areas. Nocturnal animals tend to rely more on other senses such as smell and hearing.
As evolution occurs, animals that live in dark environments have acquired many adaptations. Many have large eyes as to absorb the most light possible, such as owls. Others make use of other senses, such as echolocation (bats) or vibrations (fish) to figure out what is around them.
Animals that live their entire lives in the dark of caves are called troglobites. They have adapted over time to life in the dark with features like increased smell and hearing senses to find food, slower digestion to last them between meals, and lack of eyes and pigment (lack of eyes makes them less prone to serious injury).
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