I am writing a sci-fi that is set in a universe with a large variety of species from all sorts of worlds. When brainstorming, it occurred to me that although many animals on Earth communicate with sound, there are many more that "talk" with methods foreign to us, like pheromones, gesticulations, bioluminescence, etc...Wouldn't it make sense that sapient beings from other planets might only communicate with color-changing chromatophores in the skin, or in a pitch that doesn't even register to us? Implementing this without it getting in the way of the narrative and dialogue has been challenging, but I've really enjoyed it. Of course it being a sci-fi, technology makes translation easier. It still adds a touch of alien to any random species my human MC comes across, making them seem more than a human with a green face and wrinkle-brow. Do any of you do this with your writing? This isn't just applicable to aliens, it can be fantastical creatures or even real animals, like Fire Bringer or some of the Redwall series. What ways do you show this in your writing?