Q. How do Macaroni penguins smell?
A. Pretty bad.
For example, Lindeboom  estimated that 220 kg NH3-N was volatilized daily from a rookery on Subantarctic Marion Island occupied by 350000 macaroni penguins, and reported that the odor was apparent up to 10 km from the source.
More details can be found here.
Previous article: The smell of macaroni [part 1]
Coming soon: The smell of macaroni [part 3]
Photo credit: Via Wikpedia : ‘Macaroni Penguin, Hannah Point, Livingston Island: 62°39’S, 60°36’W, Antarctic Peninsula’. Author: Jerzy Strzelecki