Why does Clover sing Beasts of England after the rash of executions?

Clover sings "Beasts of England" after the rash of executions as a way to express her grief and solidarity with the animals who have suffered under the oppressive regime. The song symbolizes hope and unity among the animals, reminding them of their original ideals and the dream of a better future. Despite the brutal turn of events, Clover's act of singing serves as a form of resistance and a call to remember their shared struggle against tyranny. It reflects her longing for the values of equality and freedom that inspired the revolution in the first place.