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How did it learn to do that?   They probably put a piece of seed on the key while it was lit up.  Then when the bird pecked hard enough on the lit key, they reinforced that behavior with a clicker and by giving it additional seed.  They would then slowly remove the initial seed and when the bird pressed down on a LED-lit key, they would reinforce that behavior by giving it more seed and clicking noise.  Eventually, the result is what you see here.

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