1. The Efrafan's Warning: This early encounter with the black rabbit sets the tone for the entire novel. It introduces the danger of the outside world, the importance of leadership, and the importance of following one's instincts. It's a crucial moment that motivates Hazel and the other rabbits to leave their warren.
2. The Journey to Sandleford Warren: The rabbits' arduous journey across the hostile countryside is a test of their resilience and resourcefulness. It emphasizes the dangers they face, the bonds they forge, and the vital role of individual skills like Hazel's leadership and Bigwig's strength.
3. The Battle with the Efrafans: The climax of the novel, this bloody battle not only showcases the rabbits' bravery and determination but also highlights the theme of survival against overwhelming odds. The battle tests the rabbits' values, particularly their loyalty and willingness to sacrifice for the common good.
4. The Arrival at Watership Down: This moment signifies the culmination of the rabbits' journey. It represents hope, the promise of a new beginning, and the chance to create a better life.
5. The Death of Hazel: Although sad, this final moment symbolizes the cycle of life and the importance of legacy. It emphasizes the enduring impact of Hazel's leadership and his vision for the future of the warren.
It's important to note that other significant moments could be included, such as the confrontation with the Owsla, the introduction of the female rabbits, or the rabbits' encounter with the Black Rabbit of Inlé. Ultimately, the significance of each incident depends on individual interpretation and the themes each reader finds most compelling.