Definition: In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.
Input: Sentence 1: Timmy loved to look at birds. Sentence 2: Lately he had walked down the street and seen hundreds of them. Sentence 3: They were bright red and flew in a big flock. Sentence 4: Timmy read that these birds were migratory. Sentence 5: Surely enough, the very next week he didn't see a single red bird.

Birds