Crawfish Holes

During this quarantine, I have an opportunity to notice the nature right in my backyard.

This crawfish season we have huge crawfish holes. These two are interesting. They're linked, and if you look closely, you can see a hole with no tower hidden in the grass on the left. See it? You get bonus points. There were one or two other holes with no towers nearby but I couldn't get them all in the picture. The crawfish that lives there must be pretty big. Also, he's something of an architect. I wonder how crawfish build these anyway.