I wouldn't say intelligence per se as a general and relatively undefined quanta, but it does seem that flight requires heightened sense and processing regions in the brain that become larger and inflated relative to other portions of the brain. These technical regions of the brain are in the cerebral cortex, so this seems likely to cause larger brains in general.
Dann Pigdon GIS / Archaeologist http://geo_cities.com/dannsdinosaurs Melbourne, Australia http://heretichides.soffiles.com ___________________________________________________________________