  Many cosmological phenomena lead to the production of primordial black holes
in the early Universe. These phenomena often create a population of black holes
with extended mass and spin distributions. As these black holes evaporate via
Hawking radiation, they can modify various cosmological observables, lead to
the production of dark matter, modify the number of effective relativistic
degrees of freedom, $N_{\rm eff}$, source a stochastic gravitational wave
background and alter the dynamics of baryogenesis. We consider the Hawking
evaporation of primordial black holes that feature non-trivial mass and spin
distributions in the early Universe. We demonstrate that the shape of such a
distribution can strongly affect most of the aforementioned cosmological
observables. We outline the numerical machinery we use to undertake this task.
We also release a new version of FRISBHEE that handles the evaporation of
primordial black holes with an arbitrary mass and spin distribution throughout
cosmic history.
