Jay Sawyer of Chicago notes that necropsies often showed that the animals had died from blockages or lacerations. Other times, ingesting plastic may have simply weakened the animal or played no role in its death. Overall, in 82% of the cases, the animals died. According to him, in the North Atlantic, more than 80 percent of Cory’s shearwater fledglings contain plastics in their stomachs. 98% of chicks sampled contained plastics and that the quantity of plastic being ingested was increasing over time.