Why do Au Ra females have boobs?

[CyrilLucifer]

Not sure why everyone's dismissive of the OP, it's a valid question, especially on the Lore forum.
Also reality is for people without imagination? That's the most utterly absurd thing I've ever heard. Nature is incredible and crazier than most fantasy (eg, electric, flowing blue flames are a thing in nature without human interference; a certain large worm can spit out its intestines and suck them back up in order to eat, still not sure why video games haven't capitalized on that yet).

Anyway -

The vast majority of mammalian scales aren't scales in the Au Ra sense - Au Ra, like the Vanu Vanu are really where SE is showing a lack of care for non-human anatomy and just sort of merging everything together because it's what seems to look cool and familiar paired with being easy to model. That's the thing here: ease of modeling and recognizability.

As for mammals and scales -
Mammals tend to have epidermal scales, a la a mouse's tail. These scales act in place of skin. Reptiles and fish, on the other hand, often have an epidermal layer below the scales (not always, but often). More rarely, mammals have keratinized scales, like a Pangolin, but it's not the same as a reptile scute. It feels more like a fingernail - because that's essentially what it is, a giant fingernail.

If you'd like to put any science to it, you can just pretend they're thick epidermal scales rather than something with a layer of skin underneath.

(Also, just for the record, hair is a mammalian trait. All mammals have hair at some point in their life cycle on their body, even things that appear nude like whales. That Au Ra have hair is evidence that they're mammalian more than breasts).