Correct sentence:
Watch out! The colourful cassowary is very feisty.
Why this is correct (in simple steps):
- "Watch out!" is an exclamation. It tells someone to be careful and needs an exclamation mark.
- "The colourful cassowary" is the name of the bird. "Colourful" describes the bird. (In American English you can spell it "colorful".)
- "Is very feisty" tells us the bird’s behavior — it can be quick and aggressive.
Other ways to say it:
- "Watch out for the colourful cassowary — it's very feisty."
- "Be careful! The colourful cassowary can be very feisty."
All versions are simple and clear for a 7-year-old to understand.