Is there a Wind in the Willows for adults?

By LilacMarket

I’m really into books that feel kind of calm and cozy, especially ones with talking animals. Like The Moomins, Mrs. Frisby and the Rats of NIMH, Watership Down (at least some parts), and Wind in the Willows—no idea why, but those are usually my favorites. Most of these kinds of stories seem aimed at kids, though. Does anyone know if there are similar books for adults? I mean not in a “graphic/sex/violence” way—just more mature overall. And since Animal Farm is one of my all-time favorites, I’d also love suggestions where talking animals are used for darker, more tragic themes. Also, The Last Unicorn is already on my to-read list.