Alex the Parrot was different, though: he could correctly identify 50 different shapes, recognize numbers up to six, distinguish seven colors, and understand qualities such as bigger, smaller, same, and different.
Alex didn't just associate a word with a specific object: he could generalize, which is usually something only humans can do. For example, when shown various keys, he could recognize that they were the same thing and even point out differences in size and color. If you still don't think that's impressive, take a look at this video of Alex interacting with his trainer, Dr. Irene Pepperberg, and try not to freak out when he asks her for some water:
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