A dead sperm whale that washed ashore in a national park in Indonesia had nearly 6kg of plastic waste in its stomach.
Items found included 115 drinking cups, four plastic bottles, 25 plastic bags and two flip-flops.
The measured 9.5m long.
The discovery has caused concern among environmentalists.
It was not possible to say whether the plastic had caused the whale’s death.
The use of throwaway plastic is a particular problem in some South East Asian countries, including Indonesia.
Five Asian nations – China, Indonesia, the Philippines, Vietnam and Thailand – account for up to 60% of the plastic waste that ends up in oceans, according to a 2015 report.