Ravens and crows may be just as clever as chimps

A new study suggests that ravens can be as clever as chimpanzees, despite having much smaller brains, indicating that rather than the size of the brain, the neuronal density and the structure of the birds’ brains play an important role in terms of their intelligence.

Source: Despite their small brains, ravens and crows may be just as clever as chimps, research suggests: Study shows how these birds parallel great apes in motor self-regulation — ScienceDaily