We have known for a long time that some birds are very smart, such as parrots and macaws; however it is now actually being proven that many other birds (including chickens) are actually good thinkers, and quite intelligent. Parrots have been shown to have the reasoning abilities of a 3-5 year old child, and there are articles of both parrots and parakeets carrying on actual conversations, and not just mimicking words.
One of the smartest birds is the common crow, and its larger cousin, the raven. These birds have long been kept as house pets, and some have even been taught to talk. Here is a short video about a man who works with ravens, and it shows their amazing ability to reason out the answer to a problem, and then accomplish what they needed to do.
http://youtu.be/F8L4KNrPEs0
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