A form can be in a migratory bird.Logical formLearned from2 sentences. Migratory birds may carry a virus to a continent.Logical formLearned from2 sentences. Zoo may capture migratory birds.Logical formLearned from2 sentences. Migratory birds may be infected with an avian-flu virus.Logical formLearned from2 sentences. A location may be caused by migratory birds.Logical formLearned from2 sentences. Migratory birds may bring a virus to western countries.Logical formLearned from2 sentences. Concern can be about a role of migratory birds.Logical formLearned from2 sentences. Migratory birds may be infected with a (bird flu virus).Logical formLearned from2 sentences. Migratory birds can be in a region.Logical formLearned from2 sentences. Some migratory birds may be discovered on cargo.Logical formLearned from2 sentences. Routes of migratory birds may carry risk.Logical formLearned from2 sentences. Migratory birds can be in a country.Logical formLearned from2 sentences. Migratory birds may play in a transmission of avian influenza.Logical formLearned from2 sentences. Migratory birds may transmit a virus.Logical formLearned from2 sentences. A virus may be spreaded by migratory birds.Logical formLearned from2 sentences.