Do chimpanzees have an appendix, like humans do?
If we share ~98% of our DNA (at least you do) with chimps then do
chimps have an appendix?

Dear grthumongous-ga,

Yes, chimpanzees (genus Pan) and many other anthropoid apes (gibbons,
orang-utans, and gorillas) possess a vermiform appendix in common with
man. They are identical in that the vermiform appendix is a narrow,
distinct apex, the apex has a thick-walled and there is a lymphoid
concentration.

This research article discussed the primates? appendix in great
detail. I refer you to table 4 for confirmation of the above answer.

'The primate appendix: A reassessment by Rebecca E. Fisher'
http://www3.interscience.wiley.com/cgi-bin/fulltext/76503640/HTMLSTART


Other sources of information:

"The chimpanzee colon is haustrated by three taeniae over its length;
the taeniae continue along the cecum and terminate in a vermiform
appendix (Figure 1-11) (Stevens and Hume, 1995)."
Nutrient Requirements of Nonhuman Primates:  Second Revised Edition  (2003)
Board on Agriculture and Natural Resources
http://www.nap.edu/openbook/0309069890/html/24.html

The appendix in humans often occurs in the debate surrounding
evolution. This page may also interest you. It is well sourced should
you require additional information.

"A vermiform appendix is not unique to humans. It is found in all the
hominoid apes, including humans, chimpanzees, gorillas, orangutans,
and gibbons, and it exists to varying degrees in several species of
New World and Old World monkeys (Fisher 2000; Hill 1974; Scott 1980)."
http://www.talkorigins.org/faqs/vestiges/appendix.html


I hope this answers your question. If it does not, or the answer is
unclear, then please ask for clarification of this research before
rating the answer. I shall respond to the clarification request as
soon as I receive it.
Thank you
answerfinder


Search strategy
appendix gave me ?vermiform appendix?
chimpanzees "vermiform appendix"
://www.google.com/search?hl=en&lr=&q=chimpanzees+%22vermiform+appendix%22+&btnG=Search
chimpanzee "vermiform appendix"
://www.google.com/search?hl=en&lr=&q=chimpanzee+%22vermiform+appendix%22+&btnG=Search
chimpanzee caecum appendix
://www.google.com/search?hl=en&lr=&q=pongo+ape&btnG=Search

thanks answerfinder.
I wonder what Dr. Zaius would have to say.
http://www.imdb.com/name/nm0263052/photogallery

Regarding Dr. Zaius, if he were prodded by a physician seeking his
appendix, I suspect that he'd say "Don't look for it... you may not
like what you'll find." ;-)

laughing out loud.  What a classic.  Thanks Pink.

I think he'd go ape.
Thanks for the tip.
answerfinder-ga

"Yes, chimpanzees (genus Pan) and many other anthropoid apes (gibbons,
orang-utans, and gorillas) possess a vermiform appendix in common with
man. "

I am wondering what "anthropoid apes" don't "possess a vermiform
appendix in common with man."  It sounds like the Earth is literally
peopled with anthropoid apes, many of which have vermiform appendixes,
and some of which do not (since not all, only "many others" in
addition to chimpanzees and humans, possess vermiform appendixes). 
Please list!

Interesting though, that all the hominoid apes possess them, while
only humans, chimps and "many others" amongst the anthropoid apes
possess them.

Well, this answers my curiosity about this site.