Naturally dark night skies have a big role to play in supporting wildlife and park ecosystems. This spring, we reflect on Earth at night, and some of the reasons the NPS protects night skies. Many living things need and have evolved to adapt to darkness. Many species on Earth are nocturnal: Some come out at night to escape the heat of the day. Others need the night to hunt, mate, or avoid predators. Animals such as cats, owls, and rodents have developed keen hearing, smell, and dark-adapted vision in order to navigate at night.
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