How do i tell what kind of cactus they are?

Question:i have a cactus that is long and at the top it has lots of spikes.

i have a cactus that is like a oval but it is fatter on the top than at the bottom.

i have one that has spikes that are on top of these little hill sorta things.

WHAT KIND OF CACTUS PLANTS DO YOU THINK THEY ARE??

THANKS
=]

Answers:
The best way is to get a book with pictures of different cactus and compare them.

Or perhaps this link will help you.
http://images.search.yahoo.com/search/im...


Or you could try this one:
http://www.angelfire.com/ia2/arizona/pag...


Good luck!

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If they're small enough, take them to the garden center or greenhouse and ask.

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