If the pigeon tapped the disk on the left, it lit up either red or green. Red (good news) meant food would be presented after 10 seconds, while green (bad news) meant no food was forthcoming. However, if the pigeon tapped the disk on the right, it lit up yellow or blue. This did not tell the pigeon anything: the food was given at random, regardless of the colour.
If a pigeon consistently tapped left, it would only get food about once every 13 minutes.... but once every 23 seconds if they tapped right.
The birds were choosing what the researchers called the "informative choice" – one where they would know the outcome. In a sense, the pigeons were ignoring the fact that, 80% of the time, tapping left would not get them any food. They even did so when the wait for food from a red light increased from ten seconds to three minutes.
I dunno what all this means, but it's damn interesting.
http://www.bbc.com/earth/story/20160919-pigeons-choose-to-hear-bad-news-even-if-it-costs-them-food
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