Can you ID this dead animal?

[SteveDallas]

So I'm sitting at the computer playing poker, when all of a sudden my daughter bursts into the room--"Daddy, there's a dead animal outside!!!!!"

Icky. I disposed of it, but I'm curious as to what kind of animal it was. It appears to be an extremely young (possibly even fetal?) rodent or other mammal. My curiosity is partly morbid, and partly because I'm wondering if there's an injured/dead mom waiting to be discovered.

If you're interested in speculating, look at the picture. (It's somewhat gross--flies had discovered it--so maybe don't look at it if you're having a snack or something.)