Scientists found what plastic is harmful to seabirds. Marine and Antarctic studies discovered that balloons were . They said balloons were 32 likelier to kill seabirds than plastics. Balloons and soft plastics accounted for 5 per cent of plastics ingested, but were for over 40 per cent of seabird . Researchers said hard plastic can pass through the bird, but can get blocked and kill .
The study looked at 1,733 seabirds. Over a of them died because of the growing of plastic. A researcher said: "Marine ingestion is now a recognized threat....We suggest that  balloons and balloon fragments in the would directly reduce seabird ." There is 280,000 tons of marine debris . About half of seabirds eat plastic daily. Seabirds think balloons look like .