Plastics are everywhere, and the ocean is no exception: 11 million metric tons of plastics enter the ocean every year, where they spread far and wide, making their way to the deepest trenches and remote Arctic islands.

We have long known that marine animals can mistake plastic bags and other plastic pollution for food. To date, every family of marine mammal and seabird, and all seven species of sea turtles, have been documented to ingest plastics — nearly 1,300 species in total.

We also know that eating plastics can prove fatal for wildlife. When swallowed, macroplastics — plastics larger than five millimetres in size in any single direction — can block or puncture an animal’s organs or cause lethal twisting of the digestive tract, also known as torsion.

But understanding the link between ingestion of these large plastics and animal death has long........

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