There are 18 of them what are they?

Wow...could be any number of things:

18 Black and 18 Red spaces on a roulette wheel

There are 18 holes on a golf course.

Also, there are 18 different species of penguins
18 holes on a golf course

I am sure there are more to come... :)

There are 18 players on each team in Australian Rules football.

markj-ga

18 players in a National League baseball game (20 in the AL due to the
designated hitter).

There are 18 different animal shapes in the animal crackers cookie
zoo. Not sure what they are though.

There are 18 island countries in the world with populations over 1
million. Of these Great Britain has the fourth highest population.

There are only 18 verbs in Basic English, a simple version of English
designed as a way into Standard English for foreign learners.

There are 18 inhabited islands in the Faroe Islands in the North
Atlantic (and four uninhabited islands).

Of the 700+ major predictions in the Bible, some have said that there
are only 18 left to occur.

Letters in the alphabet if you stop at R.

When you get nine more, there will be 18 comments posted on this question.

18 digits on a clumsy chef who doesn't learn from his first mistake.

Recea ponor, in North West Romania, has 18 tributaries on either side
of its 5km long main active passage.

There are 18 toes on a normal housecat (ten on the front paws, eight
on the hind paws.)

Sandy57 doesn't seem to be appreciating this help.  We must not be doing it right.

How about the eighteen Dhatus enumerated by the sixth Zen patriarch, Hui Neng?

Apteryx

According to the ARRL band plan there are 18 different bands that Ham
Radio operators have privledges in.

http://www.arrl.org/FandES/field/regulations/bandplan.html

I do appreciate the answers, however so far none have been the correct
answer.  I keep trying and will keep you posted.  Thanks so much for
all of your help!!!

18 surviving artifacts?
   
"Also lost in the attack on the World Trade Center was an
archeological treasure trove of artifacts recovered from the site of
the notorious Five Points neighborhood in lower Manhattan. Stored in a
basement room of 6 WTC, some 1,400 boxes of 19th century artifacts
were destroyed along with the trade center. Out of 750,000 artifacts
only 18 survive, in the Museum's New York Unearthed exhibit."
http://www.southstseaport.org/magazine/previous2002b.html