Creaking Kia

I just bought an 06 Kia Spectra and there is a loud and steady creaking noise coming from the back that continues the whole time the car is in motion. It creaks louder going over bumps. Anyone know what this could be? It’s driving me crazy!

Bounce the rear bumper up and down, see if you can pinpoint the noise if it happens. look for signs of leakage on the rear shocks or struts as applicable, probably a shock absorber gone bad.

Thanks for your input…turned out to be dry bushings and an easy fix!