  The squashed Kaluza-Klien (KK) black holes differ from the Schwarzschild
black holes with asymptotic flatness or the black strings even at energies for
which the KK modes are not excited yet, so that squashed KK black holes open a
window in higher dimensions. Another important feature is that the squashed KK
black holes are apparently stable and, thereby, let us avoid the
Gregory-Laflamme instability. In the present paper, the evolution of scalar and
gravitational perturbations in time and frequency domains is considered for
these squashed KK black holes. The scalar field perturbations are analyzed for
general rotating squashed KK black holes. Gravitational perturbations for the
so called zero mode are shown to be decayed for non-rotating black holes, in
concordance with the stability of the squashed KK black holes. The correlation
of quasinormal frequencies with the size of extra dimension is discussed.
