what the heck are you leaving it in a car for 4 hours for??? and how big is it? in the pic, it looks like a hatchling or maybe a yearling. from what i have heard, you can keep RES and baby snappers togather, as long as they are relatively the same size. i know everybody's gonna say i shouldn't, but i have 3 baby common snappers with a few other sliders and a cooter. they dont bother each other at all. except one time when one of the snappers mistook another turtles arm for food during feeding time. and i am pretty sure it is legal to own snappers in most parts of the US.