Reference

Szabo JK, Khwaja N, Garnett ST & Butchart SH (2012). Global patterns and drivers of avian extinctions at the species and subspecies level. PLoS One 7(10):e47080.
Tershy BR, Shen K-W, Newton KM, Holmes ND & Croll DA (2015). The importance of islands for the protection of biological and linguistic diversity. Bioscience 65(6):592–597.