Pigeons have an innate predisposition to gamble?

See:

http://www.tribuneindia.com/2011/20110325/science.htm

Article reads: Scientists have shown that when faced with a choice between a series of safe, small but guaranteed rewards or a single much larger reward that is less likely to happen, pigeons will almost always choose to gamble. The findings were a surprise to researchers, because Darwinist theory would predict that the birds would be honed by natural selection to act in a way that optimises the way they behave, rather than allowing them to take unnecessary risks that are going to leave them worse off in the long term. However, the scientists believe that if pigeons have an innate predisposition to gamble then this could be a widespread trait across the animal kingdom — and might even explain why so many people like to gamble, even though they know they are likely to be worse off over time.

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