  Thanks to observations at the ESO VLT with the GIRAFFE multifibers
spectrograph, we have obtained spectra of 177 and 346 B-type stars in the Large
and Small Magellanic Clouds respectively. We have discovered 25 and 90 new Be
stars among the 47 and 131 Be stars observed in the LMC and SMC respectively.
We have determined the fundamental parameters of these stars and examined the
effect of the metallicity, star formation conditions and evolution on the
behaviour of the rotational velocities. We discovered that only the future
B-type stars with a strong rotational velocity in ZAMS will become a Be star.
We have also discovered short term variability in several SMC Be stars thanks
to a cross-correlation with the MACHO database.
