What are metaphors in Mrs Frisby and the Rats NIMH?

In "Mrs. Frisby and the Rats of NIMH," metaphors are used to convey deeper themes and ideas, particularly regarding the struggles for survival and the quest for understanding. The rats symbolize intelligence and the potential of science, representing the duality of human innovation and ethical dilemmas. Mrs. Frisby's journey reflects the resilience and maternal instinct, serving as a metaphor for the sacrifices made for family and community. Overall, the story uses these metaphors to explore complex issues like freedom, morality, and the consequences of human actions on nature.