They are called Hugins, like Huginn, the raven of Odin. I corrected the error thanks to user clarifications. I'm new to the RWBY universe. These grimms mainly attack in flocks. The opposite is extremely rare. They are very intelligent when fighting and hunting. They have gems on their backs, which are their main sources of energy. If they break, they would be vulnerable. They are also very intelligent, and you have to overcome that intelligence and cunning to fight them.

Grimm owl: Hugin.
Sorry, it was my mistake, I'm new to the rwby universe.

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