  We study the effects of superfluidity on the monopole and quadrupole
collective excitations of a dilute ultra-cold Fermi gas with an attractive
interatomic interaction. The system is treated fully microscopically within the
Bogoliubov-de Gennes and quasiparticle random-phase approximation methods. The
dependence on the temperature and on the trap frequency is analyzed and
systematic comparisons with the corresponding hydrodynamic predictions are
presented in order to study the limits of validity of the semiclassical
approach.
