Collective intelligence (n.) A tautological nomenclature that falsely suggests there are other kinds of intelligence.
Intelligence is often, wrongly, assumed to be a function of brain power. Thus psychologists attempt to measure intelligence of individuals, producing clearly nonsense results such as "this man is a genius but cannot remember his wife's bithday". In reality, intelligence is a function of a network of brains, each skilled at different aspects of problem solving, data collection, social economics, psychophysics, etc. It is the organization of the network, and especially its ability to dynamically adapt to changing problem spaces, which produces relatively faster and more accurate answers. As an aside it is worth noting that individuals in social species such as humans and parrots are not just incompetent by themselves, but they will, if kept in isolation for too long, actually go mad.