Migratory birds can be responsible.Logical formLearned from3 sentences. A country may lie on routes of migratory birds.Logical formLearned from3 sentences. A route may pertain-to migratory birds.Logical formLearned from3 sentences. Migratory birds may be blamed for a spread of a virus.Logical formLearned from3 sentences. Migratory birds may be blamed for a spread of an epidemic.Logical formLearned from3 sentences. A country may host millions of migratory birds.Logical formLearned from3 sentences. Some routes may be took for migratory birds.Logical formLearned from3 sentences. Some routes may be took by migratory birds.Logical formLearned from3 sentences. Migratory birds may travel for a winter.Logical formLearned from3 sentences. An (avian influenza virus) can be in migratory birds.Logical formLearned from3 sentences. Samples may be took from migratory birds.Logical formLearned from3 sentences. Some migratory birds may be discovered at a lake.Logical formLearned from3 sentences. An expert can be on migratory birds.Logical formLearned from3 sentences. Migratory birds may be infected with a (flu virus).Logical formLearned from3 sentences. Migratory birds may bring a virus to eastern countries.Logical formLearned from3 sentences.