  While the collective dynamics of spherical active Brownian particles is
relatively well understood by now, the much more complex dynamics of
nonspherical active particles still raises interesting open questions. Previous
work has shown that the dynamics of rod-like or ellipsoidal active particles
can differ significantly from that of spherical ones. Here, we obtain the full
state diagram of active Brownian ellipsoids depending on the P\'eclet number
and packing density via computer simulations. The system is found to exhibit a
rich state behavior that includes cluster formation, local polar order, polar
flocks, and disordered states. Moreover, we obtain numerical results and an
analytical representation for the pair-distribution function of active
ellipsoids. This function provides useful quantitative insights into the
collective behavior of active particles with lower symmetry and has potential
applications in the development of predictive theoretical models.
