In fact he wrote something far less printable. However, I agree - of course its a sturgeon. How could any idiot think otherwise? However, in our increasingly urbanized society people are less and less in touch with the natural world. A few years ago a neighbour came to us in a state of high excitement because "one of our animals had escaped" and she would call the police if we didn't come and collect it now!
It was a large elephant hawk moth caterpillar.