Hyenas

Tried searching, no info on this yet... do they grow in size?

I plan on capping one for one of my rangers and replacing his black Moa when I get one, but I haven't seen much on them yet. I'm kind of curious as to if they make sounds just as wolves howl also.

My goal is actually an elder, but if this guy does grow in size i wouldn't mind going for a hearty..
Just got my hyena to playful, it doesn't seem to grow... at least even if it does the size difference is really small
Edit again: It does grow in size, pretty big too Love it...