How do I describe Watership Down to people that have never heard of it?

I'm reading Watership Down for the first time. It's incredible. But when I talk to friends about what I'm reading, I'm like, "It's about rabbits. No, not like actual rabbits, like a story about fictional rabbits. No, not fantasy, they only do rabbit stuff, no magic. Well, I guess they can talk to each other which isn't very rabbit-like and there's also a sort of common tongue between species– by I mean it's kind of for kids not like for kids, you know? It's a very mature rabbit epic for adults too."

How would you sell this book in way that people won't think it's a dumb book about rabbits?