1. In the neighbourhood of Kyoto City where resident minor breed, migratory minor andkawarahiba immigrate in non-breeding season. To make clear the inter relation among them, observations were carried out.
2. Resident minor show high sedentariness in the forest fringe throughout winter. Most of them were pair already in winter. They form loose flocks and continuous joining and leaving are observed. They have several types of feeding grounds such as paddy fields, vegetable fields, forests, etc., so their food contents were very different individually.
3. Migratory minor form large and well-integrated flocks in the open land, and all of them feed on restricted kind of food available at a single feeding ground. They roost communally. The body size is a little larger than that of resident minor.
4. Migratory kawarahiba are observed mainly in autumn and early spring. Their feeding habitat, the state of flock, food content, roost, etc. are similar to those of migratory minor.
5. From the observations of movements, sedentariness and disappearence of many individually marked birds, it was confirmed that the flocks formed by the mingling of the birds of these groups are rare and most birds of the three groups live in segregation in habitat or season. The following matters have also been confirmed: resident minor show strong trend to stay close to their breeding areas already in winter; migratory minor have also relatively high sedentariness in the open land in winter; the flocks of kawarahiba which stop off in the open land are changing it's members in a short period.
6. Short-period observations at Higashi-kushira and Kumamoto in Kyushu confirmed that in the former area resident minor lived near forest, while migratory kawarahiba open field, however, in the latter area where there was no minor, kawarahiba used widely from the seaside to the paddy field just near forest.
7. Discussion was made about the mechanism of the segregation of these three populations. The sedentariness of resident minor in the forest fringe is closely related with the situation that most of them pair, while those two migratory groups live in the open land seem to be related to food made available temporarily in large quantity. In addition to this, the interactive relation must play an important rele in their spatial segregation in habitat.