What, all wine isn't vegan?

When I first went vegan I was really surprised to learn that wine isn't all vegan!  I mean, it comes from grapes ... what animal products could be in it?

Wineries might use animal-derived products as finings. Fining agents remove proteins, yeast, and other organic particles which are in suspension during the making of the wine.

Traditionally the most commonly used fining agents were casein (a milk protein), albumin (egg whites), gelatin (animal protein) and isinglass (fish bladder protein). 

Don't worry, there are lots of reputable wineries in New Zealand and some lovely wines to choose from.  

For an extensive and current list, check out Barnivore.