Julia Lorraine Hill (known as Julia "Butterfly" Hill, born February 18, 1974) is an American environmental activist and tax redirection advocate. She is best known for having lived in a 180-foot (55 m)-tall, roughly 1500-year-old California redwood tree for 738 days between December 10, 1997 and December 18, 1999. Hill lived in the tree, affectionately known as Luna, to prevent Pacific Lumber Company loggers from cutting it down. She is the author of the 2000 book The Legacy of Luna and co-author of One Makes the Difference. She is a vegan.