I have on a number of occasions mentioned the ongoing conflict between red and grey squirrels. Grey squirrels have been in the ascendant for some time, but recently they have faced a number of challenges, both from human alliances with the reds and the emergence of red squirrels immune to the mysterious disease that was decimating their fellows.
Now the grey squirrels face a terrible new threat. As in the world of humans, a new type of black squirrel has risen up and is becoming increasingly oppressive towards its lighter coloured fellows. Scientists have predicted that the black squirrels may soon exterminate the greys completely. The situation is so desperate that some greys are proposing the unthinkable - an alliance with the red squirrel.