Alex, the African Gray parrot who "spoke" over 100 words, has passed away. y2karl introduced MetaFilter to Alex a few years ago. Alex had been the subject of Dr. Irene Pepperberg's research for nearly 20 years. His ability to communicate with people using an extensive English vocabulary demonstrated a level of intelligence previously unthought of in birds, but critics include no less than Noam Chomsky himself. Here's a 1999 NYT article about Alex if you have never heard of this incredible bird, and a video of another gray parrot demonstrating its own talents.