Moon Jellyfish with their ethereal beauty are mesmerizing to watch. There are 1500 known species ; they are the favorite snack of Sea turtles. When plastic bags float in the water , they look like these jellyfish and turtles consume them. This results in grave injury. We can all help to eliminate this problem by using re-usable cloth-like bags for our groceries. These jellies do sting but their sting is not fatal. Photo taken at the Oregon Coast Aquarium, Newport ,Oregon.