Sept. 19 - Oct. 19

From hummingbirds and warblers to sparrows and geese, millions of birds migrate across North America every year, covering hundreds to thousands of miles. Most of these birds, some that weigh as little as half an ounce, make this remarkable and perilous journey at night, visualizing the magnetic pull of the earth and using the moon and stars to set their course. By reducing skyglow over our cities, we can help them make it to their destinations safely.