Question
Lately, I have noticed something traveling under the mulch and leaves in my yard. I travels below the mulch and leaves and I can't tell what it is. It seems that it is something small. Can you tell me what it is and should I be concerned about it.

Answer
Your description isn't specific enough to help me much. It could be shrew, or mole, or an insect.

If you like the fact that your mulch is being aerated for free, then I wouldn't be concerned at all.

Otherwise, I need more info. Visit http://icwdm.org for tips on damage identification. High res photos help too with objects in the photo for scale.