New Pet?!!

Today when I went to check the oil in the van, I got quite a surprise. I opened the hood and saw what looked like a giant squirrel dive under the engine - About. Wet. My. Pants!
I let out a squeal and dropped the hood.
After I finished my little surprise dance and the car finished filling with fuel, I finished driving the kids to fiddle lessons. When we got to lessons, I opened the hood (one of the hardest things I have ever done - reopening the hood knowing what was in there). I was hoping he would decide to hop out and go live somewhere else. He didn't. He likes the van. So I brought him back home. I did not park in the garage - still hoping he will hop out and find a new home.
Randy invited him to leave the van with the hose, but he still wants to live in the van. So we looked him up in the encyclopedia and then got a movie of him instead.
Any ideas on removing rockchucks from vans would be appreciated.

Never did check the oil.