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Millions of tonnes of plastic debris dumped each year in the world's oceans could pose a lethal threat to whales, according to a scientific assessment to be presented at a key international whaling forum this week. A review of research literature from the last two decades reveals hundreds of cases in which cetaceans - an order including 80-odd species of whales, dolphins and porpoises - have been sickened or killed by marine litter. Entanglement in plastic bags and fishing gear have long been identified as a threat to sea birds, turtles and smaller cetaceans. For large ocean-dwelling mammals, however, ingestion of such refuse is also emerging as a serious cause of disability and death, experts say. Grisly examples abound.