This little guy is a Red-backed Salamander. There are two forms of the Red-backed Salamander, the striped (seen here), and the unstriped (also known as "leadback".) Normally, the striped form consists of darker sides with a red stripe running down the back. However, at the location where I found this Red-backed, the majority of them were actually yellow. At first this may stump people trying to identify the salamanders (such as myself, for example), but I eventually learned that the striped forms can come in a variety of colors such as red, orange, yellow and white. Good to know!