@Ceili,
Ceili, I just did some poking around on Google. Bonobos and chimps are different species, I believe.
The weight of an average adult male chimp is between 70 and 100 pounds. The weight of an average adult male bonobo is about 80 pounds. So bonobos don't get as large as chimps, but they can well fit within the average range.
I found many references to pygmy chimps. I think this is now considered out of date.
My primary primate interest is chimps. But all the great apes fascinate me.