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If you've seen a butterfly in your lifetime, you probably noticed their colorful wings, or maybe you saw one basking in the sunlight from a tree branch. But I bet you didn't realize that the butterfly you saw would soon die. Why are their life spans so short, and are butterflies on their way to extinction?
Alex the gray parrot had a better vocabulary than most animals. He also had a grasp of syntax, an understanding of concepts like bigger and smaller and the ability to manipulate numbers. But was Alex simply parroting what he learned, or could he really communicate?