A monitoring of migratory birds may lead to a discovery of a virus.Logical formLearned from2 sentences. A virus may be brought to a country by migratory birds.Logical formLearned from2 sentences. Migratory birds may visit wetlands.Logical formLearned from2 sentences. Flocks of migratory birds may be sighted.Logical formLearned from2 sentences. Migratory birds may undergo a slaughter.Logical formLearned from2 sentences. A reindeer can be migratory.Logical formLearned from2 sentences. (Shark species) can be migratory.Logical formLearned from2 sentences. Grebes can be migratory birds.Logical formLearned from2 sentences. Some migratory birds may return.Logical formLearned from2 sentences. A pod can be migratory.Logical formLearned from2 sentences. A disease may be delivered by migratory birds.Logical formLearned from2 sentences. A stop can be for migratory birds.Logical formLearned from2 sentences. A migratory bird may be considered among some (bird species).Logical formLearned from2 sentences. Migratory birds may begin.Logical formLearned from2 sentences. Hundreds of thousands of migratory birds may stop.Logical formLearned from2 sentences.