  Recently within the context of a microscopic quantum theory, the Black Hole's
Quantum N-Portrait, it was shown that continuous global symmetries are
compatible with quantum black hole physics. In the present paper we revise
within the same framework the semi-classical black hole bound on the number of
particle species N_{species}. We show that unlike the bound on global charge,
the bound on species survives in the quantum picture and gives rise to a new
fundamental length-scale, L_{species} = sqrt{N_{species}} L_P$, beyond which
the resolution of species identities is impossible. This finding nullifies the
so-called species problem. This scale sets the size of the lightest quantum
black hole in the theory, Planckion.
  A crucial difference between the gravitational and non-gravitational species
emerges. For gravitational species, the lightest black holes are exactly at the
scale of perturbative unitarity violation, which is a strong indication for
self-UV-completion of gravity. However, non-gravitational species create a gap
between the perturbative unitarity scale and the lightest black holes, which
must be filled by some unitarity-restoring physics. Thus, self-UV-completion of
gravity implies that the number of non-gravitational species must not exceed
the gravitational ones.
