Aw Rats!

We inherited Nolan's parents Maxima this summer. So we are trying to sell our Ford Ranger 1994 truck. Nolan rides his motorcycle to work and I drive the mini-van to school. Well, Saturday was the day to get the truck ready. Nolan spent all day washing and waxing that thing. I tried to help clean the chrome wheels, but my hands tired and I got about 1 1/2 wheels done. I did however buy Nolan some engine degreaser so the engine would look shiny and new. Nolan came running in telling me I had to come see something. He said he opened up the hood and some great big rodent was staring him in the face. He slammed the hood and the rodent ran somewhere into the engine. He opened it again and saw a nest with two babies on the top of the engine. The mom kept poking her head up to look at her babies. It was definitely a rat. I must admit it was a lot cuter than I thought a rat would be, more Ratatioulle than sewer rat. My neighbor Jen is fearless and decided to help Nolan get rid of them. The Human Society advised my mom that we should be wary of Bubonick (sp?) plague. Here was the plan. Drive truck to field, carefully take out nest and babies, leave by truck, watch mom come out, and drive away.
Good plan, but when they got there the mom had pulled the babies further into the truck. They could hear them but not see them. They threw the nest in the field and left the truck there for a few hours. When Nolan went back he couldnt hear or see anything. He took the truck to get the oil changed and they didnt see anything. Luckily they didnt tear up any hoses or wires. We thought it was done, but when I was out this morning I swear I could hear them somewhere under the truck bed. We looked underneath and could see rat droppings and what looked like material from a new nest. We cant hear them anymore, but no promises that they are gone. I think going the humane was is out the window and we are calling the pest control people in the morning.
I would expect mice out here, BUT NOT RATS!!!!!!