This sandy mound caught my eye, because it looked like it had some weird dark encrustations growing on it:

A closer look revealed a maze of tunnels, actively being built by termites:

I’d passed this sandy mound many times before, not realizing it was a termite mound. Most of the termite mounds in our area of Australia look quite different from this one. They’re dark in colour, and are usually half way up a tree. I’m also surprised to see the termites building onto the outside of the mound in this way.

Here you can see that the termites have covered over some of the tunnels, and the roofs in the middle area are already dry and looking more like the rest of the mound: