I just finished reading Watership Down
As simple as I can make it, it's about Two rabbits who are brothers. One is psychic and he has a "vision" of "Bad things" that will happen to their current Warren (place where a group of rabbits live)
They try to warn the "Chief Rabbit" but to no avail. They get a small ban of rabbits who believe them and they take off to a "Safe Place" that the psychic rabbit had a vision of.
Along they way they have to cross a river, meet up with some rabbits who don't act like normal rabbits due to a farmer feeding and killing them. They eventually come to their safe place in the mountains, but there are no females among them.
They make friends with a Sea Gull, and the Sea Gull tells them were another Warren is, and that it is over crowded. They send a few rabbits there and it's awhile before they get back. That warren is ran by for lack of better terms a control freak Nazi of a rabbit.
They send one rabbit back to infiltrate that Warren raise in rank and get females to follow him out. There is a big fight, and they get away by floating down a river in a boat.
Eventually the crazy rabbit chief comes after them, there is a fight and they somehow get a dog to help run the other rabbits off.
In the end the Crazy Rabbit is never found, and both warrens live peacefully.
Keep in mind I really over simplified the whole book, it's really a great read. The rabbits have a history and love to tell stories about their "great rabbit"
I really don't watch Lost or I might be able to tell you how it connects better.