As results of this study, it was found that the total species observed in Mara-island was 126 species, including 43 species and 1,338 individuals at the $1^{st}$ observance, 10 species and 5,080 individuals at the $2^{nd}$ observance, 27 species and 472 individuals at the $3^{rd}$ observance, 90 species and 913 individuals at the $4^{th}$ observance, and 29 species and 268 individuals at the $5^{th}$ observance, respectively. In terms of migration types of birds, it was found that sedentary birds were 26 species, winter migratory birds were 14 species, summer migratory birds were 32 species, passage migrant birds were 40 species, vagrants were 14 species, and birds breeding in the main island of Jeju and Mara island were 58 species. In terms of dominance, it was found that Larus argentatus was at minimum 5,000 individuals (69.07%), Calonectris leucomelas was 1,000 individuals (13.81%), and each of Hirundo rustica and Emberiza pusilla was 120 individuals (1.66%) (Table 1). On the observed number basis, the number of species certified one individual a time was 45 species, the species certified 2 individuals a time was 20 species, 3~100 individuals a time was 53 species, and over 100 individuals a time was 7 species such as Calonectris leucomelas, Larus argentatus, Larus crassirostris, Hirundo rustica, Emberiza pusilla Pallas, Phylloscopus occipitalis, and Apus pacificus. The species newly recorded in Jeju island from this study were 7 species totally, and among them, 2 species such as Phylloscopus fuscatus, and Acrocephalus aedonin were found in 2006 and 5 species such as Sula leucogaster, Locustella ochotensis, Erithacus svecicus, Oenanthe pleschanka, and Phylloscopus proregulus were found in 2007.