Migratory birds may return.Logical formLearned from9 sentences. An array can be constituted-of-or-filled-with migratory birds.Logical formLearned from9 sentences. Gray whales can be migratory.Logical formLearned from9 sentences. (Songbird populations) can be migratory.Logical formLearned from9 sentences. A trail can be migratory.Logical formLearned from9 sentences. A resting can be for migratory birds.Logical formLearned from9 sentences. Grounds can be for migratory birds.Logical formLearned from9 sentences. An erythema can be migratory.Logical formLearned from9 sentences. Areas can be migratory.Logical formLearned from9 sentences. A situation can be migratory.Logical formLearned from9 sentences. Migratory birds may be found dead.Logical formLearned from9 sentences. Some migratory birds may be found dead.Logical formLearned from9 sentences. Storks can be migratory.Logical formLearned from9 sentences. A spot can be migratory.Logical formLearned from9 sentences. A spread of (bird flu) may be carried by migratory birds.Logical formLearned from9 sentences.