1975 Volume 7 Issue 6 Pages 665-680
1. Based on data of 56 censuses in July 1961-January 1962 and 124 censuses in April 1962-April 1963, and of other observations during 1960-'65, the annual number fluctuations of Long-tailed Tit Aegithalos caudatus in the Botanical Garden of Tohoku University, Sendai, are analysed.
2. As compared with territorial annual life cycle of Great Tit, the annual cycle of Long-tailed Tit is based on flock life with separate pair life in the breeding season, which is started in late December 11/2 month earlier than in the Great Tit.
3. The number of breeding Long-tailed Tit was same as the number in previous winter flock. One male bird banded among 16 birds in 1962, nested near its birth place in 1963 and '64. It was found in the same summer and autumn-winter flocks of 1962, '63 and '64.
4. Each bird in autumn-winter flock of Long-tailed Tit remains in the next spring in its winter flock (or feeding) range, the number of breeding birds in spring being about the same as that of winter flock. Thus, the home range and size of winter flocks are important in determining the breeding area and density in the next spring.
