How about some details please? Your specimen seems to be days or even weeks dead. The skin is bleached, the features are distorted, and the hair is falling out. The whiskers are quite gone. The teeth and forepaw suggest a digging rodent, such as a pocket gopher, a lemming, or even a mole rat, though the ears are rather large for that one. I can't even see how long the tail is.You don't say where you found it; whether on the shores of a lake, a stream, or a sea, whether in Alaska, Siberia, Africa, South East Asia, South America, the tropics, or the local zoo. How big is it? The size of a mouse, a rat, a rabbit? Well, I hope someone else can spot it off the cuff, but for my part I need a few clues.