Midweek Mystery

Here is your new mystery for this week. I hope it's not too spicy.
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So, here was your mystery last week. I didn't make an enlarged picture of it -- here is the original. As Paula guessed correctly, the little squiggly lines are earthworm tracks. And as Linda and Jenny guessed -- it is sand.

Here are some more pictures with earthworm tracks in mud around the house. It seems that with all the wet weather, the earthworms come out at night and "crawl" around. I suppose that is why they are called night crawlers?

{Here is a great article about earthworms and their habits.}

Some more tracks in our driveway.