Board Thread:Speculation House/@comment-71.84.15.225-20150807131522/@comment-4010415-20150914002147

Technically, the giant Nevermores are adult Grimm, and Coco cut one of them in half with her damn gun.

The Ursa Major from Forever Fall Part 2 could be considered an adult Grimm, and Jaune beheaded it after being smacked around for his incompetence.

There was an older Beowolf, which you could call an Alpha Beowolf, in The Emerald Forest when Ruby and Weiss were surrounded by Beowolves. The Alpha Beowolf was the one that Weiss was aiming for and Ruby attacked. It blocked Ruby's attack and then knocked her backward into Weiss while she was distracted. Aaaand then the forest burst into flame, and Ruby and Weiss ran.