Migratory birds may arrive in a country.Logical formLearned from6 sentences. Migratory birds may congregate.Logical formLearned from6 sentences. Migratory birds can be behind a spread.Logical formLearned from6 sentences. An effect can be on migratory birds.Logical formLearned from6 sentences. Wetlands may be frequented by migratory birds.Logical formLearned from6 sentences. (Habitat loss) can be for migratory birds.Logical formLearned from6 sentences. Migratory birds can be threatened.Logical formLearned from6 sentences. A swan can be migratory.Logical formLearned from6 sentences. Migratory birds may make a (spring passage).Logical formLearned from6 sentences. Migratory birds may stop.Logical formLearned from6 sentences. A migratory bird can be rare.Logical formLearned from6 sentences. Questions can be migratory.Logical formLearned from6 sentences. A virus may be carried into a country by migratory birds.Logical formLearned from5 sentences. Migratory birds can be from regions.Logical formLearned from5 sentences. A (flight path) can be for migratory birds.Logical formLearned from5 sentences.