The level of intelligence in birds, as a scientific inquiry, has not
been as thoroughly researched as similar questions regarding primates
and other mammals.
However, there is a general belief that they are more intelligent,
as a class, than the reptiles, and that many species are just as
intelligent as mammals of comparable size.
Because birds lack forelimbs with which to modify their
surroundings, it is often difficult to test for intelligence as we
would define it for mammals.
Traditionally, biological science has maintained that most actions
performed by birds that may indicate intelligence are merely ingrained
instinctual behaviours and that birds are unable to learn.
While parrots have the distinction of being able to mimic human
speech, studies with the African Grey Parrot have shown that some are
able to associate words with their meanings and form simple sentences.
Along with parrots, the crows, ravens, and jays (family Corvidae) are perhaps the most intelligent of birds. read more
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