old news, but I missed it the first time around: 
"Staff at a Thailand crocodile farm are nursing an unusual new arrival: a pair of conjoined crocodiles. Chang and Eng - named after the world's most famous Siamese twins - were hatched on Saturday at the Samut Prakarn zoo just south of Bangkok. The animals each have a head, but share a common lower body with one tail and have four legs each."
That picture is from 2001; if they're still alive, they ought to be a lot bigger by now, but I can't find any later mention of them! The Samut Prakarn (or "Samutprakarn"?) croc zoo doesn't seem to have a web page; the only info about it that I've found is on travel agent web sites. (And of course in the news of that woman who commited suicide by crododile there.)
Update: sketchthecow points out that they died of constipation a few months later. "'They died from failure of the digestive system, as they shared a single digestive tract', Samut Prakarn crocodile farm executive director Uthain Yongprapakorn said."
How do they poop?
A.
I'd like to think it's an "anus dentada" situation, but the text says they have a tail, which I guess is behind them in the picture.
Out each other's mouths!
It's like that Southpark where they eat in their ass and poop out their mouths! :P
That's just the sort of article I could see you getting pissed off at if it were lacking a picture. :-)
Damn right! Wouldn't you be?
I thought deformed reptiles and amphibians were normal now.
http://frogweb.nbii.gov/deformities.asp
Two-headed turtle.
A human analog to above. Also your choice of two bodies, one head, or one body, two heads.
I remember seeing a preserved eight-legged lamb (goat?) on TV but I can't find it. Oh well.
All of those human specimen photos are from the Mütter Museum. A very neat place to visit, but not for the squeamish. Personally, I find the "deformed fetuses in jars" exhibit to be the most uncomfortable.
I decided to do my own searching, and found this story:
Siamese twin crocs die of constipation
The Sun, 12 July 2001
BANGKOK, Wed: Thailand's first pair of conjoined crocodiles has died after coming down with a severe case of constipation, staff at the zoo where they were cared for said today.
"They died from failure of the digestive system, as they shared a single digestive tract", Samut Prakarn crocodile farm executive director Uthain Yongprapakorn said.
The crocodiles, joined from the belly to the tail, died on July 3. --- AFP
... the URL was http://www.jphpk.gov.my/English/July2001%2012.htm and I found it by looking for conjoined crocodiles, figuring there wouldn't be that many.
Looks like the poop speculation wasn't off the mark.