I too have an ants nest. It's not impressive and I won't post a pic to prove how poor it is. Well I presume it's a nest, it's a hole between slabs where they go in and out. Could be an ant pub or gym or something, I suppose.
I also put up two birdboxes to attract a better bird clientele into the garden. One remains empty, one had squatter wasps in it. I hate the thought of a wasps nest, so in the absence of any domestic flyspray, I squirted in WD40. I'm not sure if it's got rid of them, but there's no squeaking, so job done I reckon.
Isn't nature fab !