Interesting Wired article on a 29 year old African Grey who understands the concept of 0. I wonder I could teach Misha the same in 28 years:
Pepperberg and her students have taught Alex things using a technique called model/rival, which was originally developed by Dietmar Todt, a German expert in ethology, the study of animal behavior. The technique involves using a second person to demonstrate correct and incorrect behavior while Alex watches. For example, Pepperberg might give someone a piece of cork in response to them saying the word cork, but withhold it if they make any other noise.
Now I just need a piece of cork…
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