Well, for animals that are trying to avoid predators by staying in the darkness, light can still be very useful for the three basic things that animals have to do to survive: and that's find food, attract a mate and avoid being eaten.
Jamen, for dyr der prøver at undgå rovdyr ved at blive i mørket, kan lys være meget nyttigt for tre basale ting som dyr skal gøre for at overleve: og det er at finde mad, tiltrække en mage og undgå at blive spist.