  In this paper, we study the null controllability of a nonlinear age, space
and two-sex structured population dynamics model. This model is such that the
nonlinearity and the couplage are at birth level.
  We consider a population with males and females and we are dealing with two
cases of null controllability problem. The first problem is related to the
total extinction, which means that, we estimate a time $T$ to bring the male
and female subpopulation density to zero. The second case concerns null
controllability of male or female subpopulation individuals. Here, So if $A$ is
the life span of the individuals, at time $T+A$ one will get the total
extinction of the population.
  Our method uses first an observability inequality related to the adjoint of
an auxiliary system, a null controllability of the linear auxiliary system, and
after the Schauder's fixed point theorem.
