Green bug on my LONG BEANS ?

This is my first year planting Long Beans.
I found this little green larva eating one of my bean pod today.
It might be 1/2" long.
What is it?

Looks like a Pod Borer. I've seen similar but not in awhile. http://www.ipm.ucdavis.edu/PMG/GARDEN/VEGES/PESTS/podbor.html

Thanks, Rayder! I get those all the time and wondered what they were. They never cause enough damage to get alarmed over tho.
And thanks for asking, Drthor :0) Now I know.

Thanks for your quick reply.
My box tortoise loves any kind of bug I gave her ...