  In this paper, we study the influence of an Allee effect on the spreading
rate in a local reaction-diffusion-mutation equation modelling the invasion of
cane toads in Australia. We are, in particular, concerned with the case when
the diffusivity can take unbounded values. We show that the acceleration
feature that arises in this model with a Fisher-KPP, or monostable,
non-linearity still occurs when this non-linearity is instead bistable, despite
the fact that this kills the small populations. This is in stark contrast to
the work of Alfaro, Gui-Huan, and Mellet-Roquejoffre-Sire in related models,
where the change to a bistable non-linearity prevents acceleration.
