This is the collected wisdom gathered from previous answers to this peculiar question: Newt, Nutria, Noolberger, Narwhal, Nilgai, Numbat, Nightjar, Nautilus, Natterjack toad, Nepal tiger, Newfoundland dog, New Forest pony, Nightingale and -- you can take ot ;leave these ones -- Nellie the Elephant, Ninja Turtles, a nelephant and a nostrich!
Well - this just has to be a wind-up, doesn't it? This question has been asked so many times and the askers never respond to the question of why they are asking. It was only a few days ago that oliviac asked this and didn't have the curtesy to explain the reason for the question. And you, melneal, only have to look down the page to see the previous answers to this. So, melneal, are you going going to either own up or explain the reason for asking?
I don't know why this was posted originally. I think that the reason for asking is that it's a game where you take it in turns to name something, country, animal etc starting with a different letter of the alphabet. For some reason "N" is always really hard when guessing animals! I always went for the Natterjack Toad option, when I was a kid!