Hello. It’s me again, this time with a self administering dose of confusion: what would an Angel mating dance look like? Assuming they behave similarly to birds?

Considering that there’s only one angel that ever learned a dance at all, I would imagine it would necessarily be the gavotte.

That being said, not all birds dance. Consider the bowerbird, for example, who builds elaborate nests out of things it collects, usually of the same color or substance:

Aziraphale is obviously making his extremely good nest out of books he has collected. And I mean, it works, right? Crowley keeps coming back to it, anyway.