  The physics of heavy quarks becomes a very reach area of study thanks to an
excellent operation of hadron colliders and $B$-factories and exciting results
from them. Experimental data obtained allows to get some information about the
heavy hadron dynamics. In this case, the models for the heavy hadron
wave-functions are required to do theoretical predictions for concrete
processes under study. In many cases, the light-cone description is enough to
obtain theoretical estimates for heavy hadron decays. A discussion of the
wave-functions of the $B$-meson and heavy bottom baryons in terms of the
light-cone distribution amplitudes is given in this paper. Simple models for
the distribution amplitudes are presented and their scale dependence is
discussed. Moments of the distribution amplitudes which are entering the
branching fractions of radiative, leptonic and semileptonic $B$-mesons decays
are also briefly discussed.
