Watership Down

"A rabbit has two ears; a rabbit has two eyes, two nostrils. Our two warrens ought to be like that. They ought to be together—not fighting. We ought to make other warrens between us—start one between here and Efrafa, with rabbits from both sides. You wouldn't lose by that, you'd gain. We both would. A lot of your rabbits are unhappy now and it's all you can do to control them, but with this plan you'd soon see a difference. Rabbits have enough enemies as it is. They ought not to make more among themselves. A mating between free, independent warrens—what do you say?" Watership Down

One of my favorite books from my youth. I still have my copy with its yellowed and bent pages. I think of it every time I see a rabbit.