Survey results performed in June and September 2011 of Bigeum and Docho islands showed 3,828 individuals in 84 species of birds to understand bird diversity of the two islands through joint ecological surveys by Korean Biodiversity Consortium. Dominant species consist of 716 Hirundo rustica (18.70%), 707 Passer montanus (18.47%), 335 Charadrius alexandrinus (8.75%) and 197 Egretta alba modesta (5.15%). By months, 1,899 individuals of 58 species and 1,989 species of 62 species were discovered in June and September, respectively. However, the frequencies do not show much difference. Diversity and abundance of species are 3.07 and 10.06, respectively.