In the peninsular and continental regions the National Geographic Explorer took us, summertime brings adelies, gentoos, chinstraps and the rare emperor penguin. How to tell them apart? Here’s a nifty guide. (Hint: It’s not hard.)     The Adelie At half the size of an emperor penguin, an adelie is one of the smallest penguin species. They are entirely black and white, and prefer colder climates. The Gentoo The easiest way to tell a gentoo apart from other penguin species [...]