Artificial light in the night alters the sleep rhythm of many animals, resulting in not getting sufficient rest for the body to recover. Because of this animals repel from light polluted areas where they would normally make a living, causing a form of habitat loss. On the contrary other animals are attracted to light sources, such as sea turtles, bats, frogs and many insects.
For example, sea turtles lay their eggs on the beaches. When born, the hatchlings need to navigate to the sea in order to survive. In order to do so they follow the reflections of the moonlight on the ocean. This lets them know exactly where they need to go to reach the sea.