Earlier quoted context omitted.
luckily, the really deadly cassaworys have not yet learned to swim
And forgotten how to fly
annecdote: i once went for a job at edinburgh university zoology department (i would have been about 19 at the time), and was confronted with a mostly disected mess.
interviewer: what do you make of that?
me: it looks like a badly disected cassowary.
it was a cassowary (where from, who knows - they don't roam wild on arthur seat) and i didn't get the job (good).