  Recent measurements of top-quark properties at the Tevatron are presented.
CDF uses data corresponding up to 9.0 fb^{-1} to measure the ratio R of the
branching fractions B(t \rightarrow Wb) / B(t \rightarrow Wq), the branching
fraction for top-quarks decaying into \tau leptons and the cross section for
the production of an additional \gamma in t\bar{t} production. The results from
all these measurements agree well with their respective Standard Model
expectation. D0 uses 5.3 fb^{-1} of data to measure the t\bar{t} cross section
as a function of the time. A time dependency would imply Lorentz invariance
violation as implemented by the Standard Model extension. No time dependency is
observed and D0 sets first limits in the top-quark sector for Lorentz
invariance violation. D0 also determines indirectly the top quark width using
the results of earlier measurements at D0. The measured top quark width is in
agreement with the SM expectation and does not show any hints for new physics
contributions.
