Migratory birds may be blamed for transporting a virus.Logical formLearned from2 sentences. A disease may arrive with migratory birds.Logical formLearned from2 sentences. A country can be on a (flight path) of migratory birds.Logical formLearned from2 sentences. Migratory birds may be blamed for spreading a virus.Logical formLearned from2 sentences. A village can be on a (flight path) of migratory birds.Logical formLearned from2 sentences. Thousands of migratory birds may drop dead.Logical formLearned from2 sentences. (Mass deaths) can be constituted-of-or-filled-with migratory birds.Logical formLearned from2 sentences. Migratory birds may descend.Logical formLearned from2 sentences. A habitat may pertain-to migratory birds.Logical formLearned from2 sentences. Migratory birds may arrive.Logical formLearned from2 sentences. Migratory birds may arrive in an area of a delta.Logical formLearned from2 sentences. (Blood samples) may be took from migratory birds.Logical formLearned from2 sentences. Tests may be carry_outed on migratory birds.Logical formLearned from2 sentences. A migratory birds may undergo deaths.Logical formLearned from2 sentences. Authorities may monitor migratory birds.Logical formLearned from2 sentences.