  We investigate a six-species class of May-Leonard models leading to formation
two types of competing spatial domains, each one inhabited by three-species
with their own internal cyclic rock-paper-scissors dynamics. We study the
resulting population dynamics using stochastic numerical simulations in
two-dimensional space. We find that as three-species domains shrink, there is
an increasing probability of extinction of two of the species inhabiting the
domain, with the consequent creation of one-species domains. We determine the
critical initial radius beyond which these one-species spatial domains are
expected to expand. We further show that a transient scaling regime, with a
slower average growth rate of the characteristic length scale $L$ of the
spatial domains with time $t$, takes place before the transition to a standard
$L \propto t^{1/2}$ scaling law, resulting in an extended period of
coexistence.
