Given the number of galaxies, the vast number of systems, planets, etc., would you say that intelligent life exists elsewhere?
BTW, Vercigetorix was an early childhood hero of mine. Even had a French penpal at the time send me a series of stamps that France had put out featuring V'rix. Unfortunately, they disappeared in a move from one home to another. (Caesar probably would've said that "intelligent" life didn't exist elsewhere until he met the warriors of V'rix.)
Cellular life may be common in the Universe or it may be exceedingly rare. There is no way at present of knowing what, precisely, is required for life to form. If cellular life is established and persists on a planet then in all probability multicellular forms will evolve. Intelligence develops naturally in those organisms that have sensors and actuators; a control system mediates the response to the environment. When does this control system begin to exhibit intelligence? Are porpoises intelligent? How about elephants or chimpanzees. Clearly every vertebrate animal exhibits intelligence but so do many invertebrates albeit to a lesser degree (cephalopods, crustaceans, arachnids). Therefore estimating the probability that intelligent life exists elsewhere depends on the probability that life itself exists elsewhere.
Because life exists here but not on other nearby planets we know that life is at least somewhat rare. Because intelligent life abounds here we know that the probability of intelligent life elsewhere is at least a finite number greater than zero.