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One of nature’s great marvels that few people know about is that millions of birds are actively flying over the ocean at night, including billions of birds that migrate over the ocean every spring and fall. Shorebirds, waterfowl, and songbirds travel extraordinary distances using cues such as light from the stars and the moon to navigate their migratory journeys. Seabirds travel and forage across vast areas of the ocean in all seasons. Before humans devised electric lighting, the moon and the stars used to be the brightest objects at night, and their phases and illumination are critically important to birds and other wildlife.