@calmbreez
Well you always have some sacrifices in fidelity if you want to make it rhyme and have meter. If you want a more literal translation:
I am koala from australia, a killer
I'm a gourmand who only eats eucalyptus. I don't know about capybaras. What do you usually eat? Tell me.
I'm capybara! I eat some grass I don't know the name of.
You want to know what kind of grass? I seriously don't know, but I always eat it!