I believe it's some type of sawfly, not really a caterpillar.

Sherry

Some body segments appear to be lacking legs, that would make it a caterpillar.

I'm agreeing with Larry Gene that it is a caterpillar but with those pics, there is no way to make a positive ID.

Okay, caterpillar it is.

There are SO many caterpillars out there, even a lepidopterist probably couldn't identify them all. Most that we don't know make plain little moths.

Sherry

Orange,
I recommend you get a copy of Wagner's main caterpillar book. His owlet caterpillar book is good too but the price has gone nuts.

http://press.princeton.edu/titles/7939.html

4 pair abdominal prolegs typical of noctuid moths, that narrows it down to ~12,000 possibilities.