Abstract
The authors examined the stomach contents of 636 dead birds (38 species) that were recovered at Tokyo International Airport and the adjacent areas. Of these, 228 birds (35.8%) ingested plastic particles in their stomachs. Anseriformes and Columbiformes, which have developed and musculative gizzards, ingested more plastic particles than other orders. Furthermore the Anseriform had a tendency to ingest more greenish and stringy plastics like marine plants or other kinds of botanical fibers. Whereas the Columbiform took more yellowish plastics similar to botanical seeds and grain of Indian corn. Those facts suggested that the plastic particles were ingested selectively as food just as grid.
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