Posted by Farrah Paul, Communications Lily in 2015. Photo by Dennis Dow/Woodland Park Zoo. We have some very sad and difficult news to share. We will soon say goodbye to our beloved hippopotamus Water Lily, who has experienced declining health and quality of life following a cancer diagnosis last month . Veterinarians and caretakers have made a difficult end-of-life decision for the 45-year-old hippo, affectionately known as Lily, who will be humanely euthanized early next week. She will be surrounded by her loving animal keepers and an empathetic, expert team of veterinary animal health professionals. The zoo recognizes that our staff, volunteers, members and community feel deeply connected to Lily and may wish to use the next few days to visit her or celebrate her life. Lily will continue to enjoy her pool and outdoor habitat over the coming days and should be visible to those who come to say farewell. Community members may continue to see Lily through Sunday, April 28, after wh...