  We show that the decay of strongly excited oscillons in a single vacuum model
reveals a chaotic, fractal-like pattern very much like one found in
kink-antikink collision in the $\phi^4$ model. This structure can be attributed
to the resonant energy transfer mechanism triggered by the modulations of
amplitudes of constituent oscillons which form the excited oscillon. We also
find evidence that such modulations arise as a motion of two quasi-breathers
inside the constituent oscillon.
