What goes up must come down! Balloons return to the land and sea where they can be mistaken for prey and eaten by animals. Balloons are hazards when they enter the aquatic environment because they can look a great deal like jellyfish—a major source of food for many animals. Sea turtles, dolphins, whales, fish, and seabirds have been reported with balloons in their stomachs. In 1985, an infant sperm whale was found dead of starvation as a result of ingestion of an inflated Mylar balloon which had lodged in its intestines. Ribbons and strings tied to balloons can lead to entanglement.Latex rubber balloons are an important category of product in the marine environment. Promotional releases of balloons that descend into the sea pose a serious ingestion and/or entanglement hazard to marine animals. Based on the fairly rapid disintegration of balloons on exposure to sunlight in air, the expectation is that balloons do not pose a particularly significant problem. In an experiment we carried out in North Carolina we observed that balloons exposed floating in seawater deteriorated much slower than those exposed in air, and even after 12 months of exposure still retained their elasticity."