Chapter 13.
One thing I find interesting is how several things about Cowslip's warren seem weird at first, but after one finds out its dark secret it all makes sense.
For example, there is no point in trying to conceal the warren, as the farmer shoots all the elil. Also, when Hazel says:
Cowslip, you said your warren wasn't large, but judging by the holes we saw along the bank, it must be what we'd reckon a fine, big one.
It's not that big because of the wires, which explains the rather awkward feeling that followed.
Fiver stays away from the others, since he has a bad feeling about the entire warren and didn't want to go there in the first place.
After Strawberry talks about how great the warren is, Hazel notices that he "did not sound particularly happy", once again because of the warren's dark secret.
And at the end of the chapter, when Strawberry calls for Kingcup, he isn't there. On my first reading I quickly forgot about that, and only realized later on that he had been killed in a snare.
Pipkin, some way away from Hazel, crouched at his ease between two huge rabbits who could have broken his back in a second, while Buckthorn and Cowslip started a playful scuffle, nipping each other like kittens and then breaking off to comb their ears in a comical pretence of sudden gravity.
I found this cute

His doe's a beautiful creature, too. Perhaps there are some more like her in the warren.
Hazel attracted to Nildro-hain?

Some important person once said that art can only surface when a community, as a whole, has moved beyond the stage of basic survival. The creation of something like a Shape in Cowslip's warren seems to indicate this. The rabbits don't have to forage at all so they have lots of spare time that they can utilise in other ways.
The idea that such abstract representations of ideas, art, that kind of thing, would be foreign to a creature that spends much of its life running and fighting for survival, that makes sense. The rabbits of the warren have no need to worry about predation or disease or hunger, so they tend to distract themselves from the true danger.
This is interesting; I remember watching some documentaries about this, and it makes sense about Cowslip's warren.
(a bit off-topic, but I was rather pleased with the way the shape was depicted in the TV series; too bad it wasn't in the film)
Both rabbits together made a curious, dancing movement of the head and front paws.
This part made me laugh
I hope they put it in the mini-series.
I hope so too. I didn't really like the way the TV series handled it. Based on the description in the book it reminds me of this:
Specifically at around 0:08, but watch the whole thing it's really cute. Also this video was made several years ago, and all rabbits involved appear to have been adopted since

This was cute. I didn't realise Hazel and Pipkin had so many cute moments together! 
This is an underrated friendship, there should be more fanfics about these two.
Men will shoot anything... 
Sad but true

I'm reading along via audiobook now,
@Hammy I think there are several audiobook versions of WD; which one are you listening to, and how are you liking it?

The name "Poison Tree" may well be foreshadowing in its own right, seeing how the warren lives under a tree.
I never quite realized that before. Fascinating.
Also, Kingcup is dead. Kingcup is so incredibly dead.
My heart has joined the Thousand, for Kingcup stopped running today 
Fiver looked as though he was about to speak, but then shook his ears and took to nibbling at a dandelion.
1) I first misread that as 'nibbling at Dandelion'
(probably because it was in response to Dandelion)
That could possibly be interesting

I hope to read chapter 14 tomorrow.