The concept for this one came to me pretty quickly, but I had to do some research to find an animal that had a visually distinct mating ritual. I decided on the bright red chest of the male Frigatebird, though I don't think I'm using it 100% correctly below. From what I have read, it seems that is used to attract a mate, not necessarily to scare off competitors. Sorry if this inaccuracy irks any ornithologists out there!
The next theme: Mirror