  We show that the entanglement entropy of single quasiparticle excitations of
one dimensional systems exceeds the ground state entanglement entropy for
log(2), if the correlation length of the system is finite. For quadratic
fermion systems we show that the excess of entanglement is related to the
number of quasiparticles in the excited state. This observation is confirmed by
numerical examples of one dimensional quantum many-body systems, including
nonintegrable. Tensor network methods to describe quasiparticle excitations are
discussed.
