2. Parrots name their infants.
Scientist Karl Berg studied green-rumped parrotlets and found that, shortly after they were born, the babies tended to respond to very specific peeps from the other birds. And, as Berg tells author Virginia Morrell in her book Animal Wise, the parrots also learn the peeps associated with their family members, and can use them in "conversation." In one of Berg's experiments, he swapped eggs from different nests to see if the specific types of chirps were genetic or learned. The results of the study strongly suggest that the peeps are actually learned, and that it is the parrot parents who are giving the babies their specific contact calls, or "names."
3. Pigeons gamble.
It would be highly unlikely to find pigeons playing the slots in Vegas (though, given the rapid advancements in our society, I'm not ruling it out just yet). However, these birds actually gamble in a manner that is very similar to humans. In a study published by Thomas R. Zentall and Jessica Stagner in The Proceedings of the Royal Society B, researchers created an apparatus that was similar to human slot machines and had the pigeons peck at different keys to receive different amounts of food pellets. The scientists discovered that the majority of the birds were much keener to peck the key that had once put out 10 pellets, as opposed to the key that consistently gave out 3 pellets every time. Basically, the pigeons preferred to try for the jackpot rather than play it safe -- just like human gamblers.