Zabrak can crossbreed with most other nearly-humanoid and human species. That's how the Nightkin on Dathomir got started. Settlers on the planet in the form of Zabrak males interbred with human females for a very long time until a whole separate subspecies got started.

[He nods slowly at what she says about Savage.]

You are right there. I try to give him gentle nudging sometimes but when that doesn't work it takes firm shoving in the direction of what I think he wants instead. He has his own desires, he just doesn't verbalize them very often.

[He looks a little amused when Usagi mentions hating mysteries.]

I grew used to it after being raised by two people who thrived on being mysterious and keeping people guessing at all times.