  Whether there is a superluminal object existing in the real world is a
mystery in modern physics. Recently, OPERA collaboration claims that they have
observed superluminal neutrinos in their experiments. This leads to a rest mass
paradox by combining the observational results from SN1987A, if one considers
the neutrino as a tachyon. In this paper, we identify the neutrino as a
tachyonic chameleon, whose mass depends not only on coordinate frame but also
on the environment, in which the neutrino propagates without the need of
violation of the Lorentz-invariance at a fundamental level. We have compared
our results with these observations and made some predictions that can be
tested in the near future. Also, we have clarified the concept of rest mass for
subluminal and superluminal object.
