Migratory birds can be infected.Logical formLearned from40 sentences. Flocks can be migratory.Logical formLearned from39 sentences. A corridor can be migratory.Logical formLearned from39 sentences. Waves can be migratory.Logical formLearned from38 sentences. A stopover can be for migratory birds.Logical formLearned from38 sentences. A (water fowl) can be migratory.Logical formLearned from37 sentences. A phenomenon can be migratory.Logical formLearned from37 sentences. Migratory birds may carry a virus.Logical formLearned from37 sentences. Migratory birds may undergo an arrival.Logical formLearned from36 sentences. Large numbers can be constituted-of-or-filled-with migratory birds.Logical formLearned from36 sentences. Pressure can be migratory.Logical formLearned from32 sentences. A worker can be migratory.Logical formLearned from31 sentences. Herds can be migratory.Logical formLearned from31 sentences. A flight can be migratory.Logical formLearned from30 sentences. A species can be migratory.Logical formLearned from30 sentences.