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As mentioned in the description.

"The animal people who populate the game were originally developed in short stories written by game creator; these stories are included as the in-game bonuses"

I've done research and have seen that this game has two versions a premium edition that is not sold on GOG and the basic version which is sold by GOG. I'm just wondering if these stories are included here on GOG or not. All it appears as bonuses here are the wallpaper and avatars.
I can confirm that the audio books are in the GOG version of this game. You need to unlock them from a certain character as you play, but it's not hard to do.

The only thing that is missing from the Premium version is the sound track and the short comic.
I just become aware that a premium edition exists and I created a wish on GOG to include it. The name of the wish is "The night of the rabbit : Premium edition".
I hope this will come true.

Because nothing is impossible.

PS: I add some precision about the audio books.
First, they're really good (like small tales, often related to the story of the game).
Second, the reason I added a wish for the premium edition is because listening to it is kind of annoying as the player is included in the game. I would have be thankfull to listen to them on my music player while doing other things.
And finaly, I totaly agree on the point that they are really easy to find.