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While walking in an animal trail for envilonmental research,occasionally I find a few kan-aoi along the trail though kan-aoi growing group can't be found nearby .One day I was in an animal trail . I found a few kan-aoi but saw no growing group around . There was a community of tairin-aoi (A. asaroides) (600u) at intervals of 350 meters in a straight line from there . That was the place where I finally located some kan-aoi .I don't recognize the ecology of ants , but I'm wondering it is too long for ants to carry the seeds of kan-aoi .No consecutive growing location was found along the way , in addition there was a little stream halfway between the two spots .Gazing at the kan-aoi beside the animal trail , I was eager to trace where this species came from .According to the late Doctor Maekawa , "ants can spread the distribution of kan-aoi , and the distance around the year is short ." Then there should be a succession of spreading the area . His theory doesn't apply in this case .Some gifu-chou (Luehdorfia japonica) researchers mention that mice eat the seeds . I support this opinion . Mice eat the seeds then weasels , martens and foxes eat those mice .I suppose the distribution spread through their feces .The reason is the distribution of kan-aoi is often seen along a marten trail etc .Furthermore the habitat of kan-aoi is・the place where no pile of sand from the upper area , moreover scattered where no distribution is found around .・the place where there's pile of sand although there is no habitat in a large part of the upper area .・the place where these creatures' habitat was identified by environmental reseach .Harvest Mouse (their nests were identified near habitat of kan-aoi )Large Japanese Field MouseJapanese MartenRaccoon Dog (exception They don't defecate along the trail )These are the points to be considered .In my opinion there is a good possibility that the distribution range of kan-aoi can be spread out mediated by weasels , martens and foxes rather than by ants .Migratory birds (Dusky Thrush、Woodcock etc ) whose feeding area is on the ground and raptorial birds that eat rodents also have the possibility to spread the distribution of kan-aoi . I haven't got the data to issue with confidence yet .