A team of researchers from Australia, the U.S., Indonesia and New Zealand has measured the amount of plastics that manta rays and whale sharks are ingesting off the coast of Indonesia. In their paper published in the journal Frontiers in Marine Science, the group describes how they measured the ingestion of plastics by the marine animals.

https://www.google.com/amp/s/phys.org/news/2019-11-manta-rays-whale-sharks-consuming.amp