わたどり
渡り鳥
1. migratory bird; bird of passage
2. Bird migrationBird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat, or weather. Sometimes, journeys are not termed "true migration" because they are irregular (nomadism, invasions, irruptions) or in only one direction (dispersal, movement of young away from natal area). Migration is marked by its annual seasonality.
Read “Bird migration” on English Wikipedia
Read “渡り鳥” on Japanese Wikipedia
Read “Bird migration” on DBpedia
Read “Bird migration” on English Wikipedia
Read “渡り鳥” on Japanese Wikipedia
Read “Bird migration” on DBpedia
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