The saddest thing I've read today

Alex, an African Grey Parrot, who knew at least as much English as President Bush, died this week at the age of 31. He had been the subject of much research for the last few decades. There's a story/ obituary in the New York Times that ends with the following:

"Even up through last week, Alex was working with Dr. Pepperberg on compound words and hard-to-pronounce words. As she put him into his cage for the night last Thursday, she recalled, Alex looked at her and said: “You be good, see you tomorrow. I love you.”

He was found dead in his cage the next morning, Dr. Pepperberg said."