Abstract
1. Roost-flock observations were made at Kawanakajima-area, Nagano, 1964-1967.
2. Daily movement distance of 30 flocks ranged 160-2, 800 (Av. 802)m. Those with roost within the daily movement range, the distance was 160-760 (Av. 433)m and when the roost was outside of it, 300-2, 800 (Av. 1, 072)m.
3. A flock consisted of 9-45 (Av. 22.9) birds, and moved within 11-42 (Av. 21.8) ha.
4. The density within a movement area varied 0.5-2.08 (Av. 1.03) birds/ha and in the total study area (including unused part) of 27km2, there were 687 birds with the density 25.4 birds/km2 (0.25/ha).
5. Local flocks were distributed well in relation to orchards but avoided paddy fields.
6. The roosts were distributed so as to unite some local flocks and there were stable and unstable roost flocks.
