What kind of animal did this?

I found it on top of dirt, but it's mud piled up into what looks like a nest of some sort. It's about 3 inches tall, feels like a giant dirt bomb, but underneath, it is filled with soft, damp dirt. It's almost like something pooped out mud and then it dried. I wanna open it, but I am afraid of damaging... show more I found it on top of dirt, but it's mud piled up into what looks like a nest of some sort. It's about 3 inches tall, feels like a giant dirt bomb, but underneath, it is filled with soft, damp dirt. It's almost like something pooped out mud and then it dried. I wanna open it, but I am afraid of damaging it, if there is an animal inside. Wish I could post a pic or two, because I have a few great pictures of it.
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