All over the world, sea turtles are swallowing bits of plastic floating in the ocean, mistaking them for tasty jellyfish, or just unable to avoid the debris that surrounds them.

Now, a new study out of Australia is trying to catalog the damage.

While some sea turtles have been found to have swallowed hundreds of bits of plastic, just 14 pieces significantly increases their risk of death, according to the study, published Thursday in Scientific Reports.

Young sea turtles are most vulnerable, the study found, because they drift with currents where the floating debris also accumulate, and because they are less choosy than adults about what they will eat.

Worldwide, more than half of all sea turtles from all seven species have eaten plastic debris, estimated Britta Denise Hardesty, the paper’s senior author and a principal research scientist with the Commonwealth Scientific and Industrial Research Organization in Tasmania. “It doesn’t matter where you are, you will find plastic,” she said.