'Don't anger the green owl'

Sorry, it's a DuoLingo post. I use a habit app to help me do my daily activities, and I want to subtitle my Romanian lesson reminder with some actual Romanian encouragement (and be a bit silly in the process).

I have provisionally come up with 'don't anger the green owl' - 'nu mânia bufnița verde'. Am I correct? Totally wrong? Is there a more natural way to say it?

Mulțumesc foarte mult.