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Abstract
The author investigated the birds of Teuri and Yagishiri Islands Hokkaido, in the middle of June, 1951, and aquired a knowledge of the avifauna of that region during the breeding season.1. Twenty-eight species were recorded on Teuri, and Thirtythree species recorded from Yagishiri.2. The avifauna of both islands is concentrated, and many birds adapt their habits to the environment.3. More protection must be afforded to the sea birds on Teuri since they are decreasing.4. An interesting addition to the zoogeography is the occurrence of Alauda arvensis lonnbergi and AL a. japonica in the same territory on Yagishiri.5. Larvivora sibilans and Eurystomus orientalis abundus have been collected on Yagishiri.6. Falco peregrinus leucogenys may be breeding on Yagishiri.7. Many migratory birds make use of both islands as resting places, so both islands are important locations for the protection of migratory birds.8. The birds of Anatidae and Ardeidae are few, indicating that the main migratory route does not pass over the islands.
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