  The spherically symmetric magnetic monopole in an SU(2) gauge theory coupled
to a massless Higgs field is shown to possess an infinite number of resonances
or quasinormal modes. These modes are eigenfunctions of the isospin 1
perturbation equations with complex eigenvalues, $E_n=\omega_n-i\gamma_n$,
satisfying the outgoing radiation condition. For $n\to\infty$, their
frequencies $\omega_n$ approach the mass of the vector boson, $M_W$, while
their lifetimes $1/\gamma_n$ tend to infinity. The response of the monopole to
an arbitrary initial perturbation is largely determined by these resonant
modes, whose collective effect leads to the formation of a long living
breather-like excitation characterized by pulsations with a frequency
approaching $M_W$ and with an amplitude decaying at late times as $t^{-5/6}$.
