The difficulty of defining or measuring intelligence in non-human animals makes the subject difficult to study scientifically in birds. In general, birds have relatively large brains compared to their head size. The visual and auditory senses are well developed in most species, though the tactile and olfactory senses are well realized only in a few groups. Birds communicate using visual signals as well as through the use of calls and song. The testing of intelligence in birds is therefore usually based on studying responses to sensory stimuli.

The corvids (ravens, crows, jays, magpies, etc.) and psittacines (parrots, macaws, and cockatoos) are often considered the most intelligent birds, and among the most intelligent animals in general; pigeons, finches, domestic fowl, and birds of prey have also been common subjects of intelligence studies.

 

Note:   The above text is excerpted from the Wikipedia article Bird intelligence, which has been released under the GNU Free Documentation License.