Any idea what this noise means?

[Gemsbok]

I finally caught this noise on video! Coyote was sitting on my lap, letting me pet her while i took snapchat videos of it; i finally caught her 'purr' just as I tried to boop her comb. I'm not sure if it's a pleased noise or an annoyed noise though, any thoughts? she stayed right where she was and kept making that sound for sometime after that, until i physically put her back down.

 

[GitaBooks]

I'm not sure. My hens don't make that noise. It sounds like a "growl" (chicken version) except for she didn't look aggressive while making it.

She's a beautiful girl!