"In the past, people thought birds were stupid," laments the aptly named scientist Christopher Bird.
But in fact, some of our feathered friends are far cleverer than we might think.
And one group in particular - the corvids - has astonished scientists with extraordinary feats of memory, an ability to employ complex social reasoning and, perhaps most strikingly, a remarkable aptitude for crafting and using tools.
Some corvids, such as rooks, live in large groups
Mr Bird, who is based at the department of zoology at Cambridge University, says: "I would rate corvids as being as intelligent as primates in many ways."
The corvids - a group that includes crows, ravens, rooks, jackdaws, jays and magpies - contain some of the most social species of birds.
For more, and some interesting videos:
BBC NEWS | Science & Environment | Meet the brains of the animal world
Apart from being a thoroughly interesting article, it also raises some good questions on what intelligence is, how to define it.. I agree with the researchers that the behaviour of these crows might very well be 'intelligence', but where do you draw the line? Is an animal intelligent if it passes the mirror test? If it uses tools? If it lives in complicated social communities (like ants or bees)?