Got it. Paid attention to my notes.... not "een kort staart".....!
Can you help me why use korte instead of kort?
They explain it here: https://www.duolingo.com/comment/3888221
On a scale of 1-10 for how complicated the rule is, I'd give it a 4. What makes it really difficult for learners is memorizing what words are common gender and what words are neuter.
Because "een staart" is a De-noun "de staart not het staart" and all de-nouns take an "e" when they have een before the work
It's so confusing with dier sounding like deer but deer is hert