Tire-Road-Wear Particles and Glass Beads in the Gizzard of the Endangered Terrestrial Bird, Okinawa Rail ().

This study analyzed microplastics and glass beads (GBs; an indicator of traffic-derived particulate contamination) in 42 gizzards of an endangered terrestrial bird, the Okinawa rail (). Black rubber fragments (BRs) were found in 57% of the specimens (1-184 items/individuals), and GBs were found in 48% (1-32 items/ind.).