<p>A colony of <a href="http://animals.nationalgeographic.com/animals/birds/gentoo-penguin/">gentoo penguins</a> perch on a rocky cliff on Danco Island, <a href="http://travel.nationalgeographic.com/travel/continents/antarctica/">Antarctica</a>.</p> <p>In honor of Penguin Awareness Day, we decided to dive into the National Geographic photo archive to look at the bird with the iconic tuxedo coat and characteristic waddle. (<a href="http://animals.nationalgeographic.com/animals/photos/penguins/">See more penguin pictures</a>.)</p> <p dir="ltr">All 17 species of penguins, which range in size from the 3.3-pound (1.5 kilogram) little blue penguin to the 88-pound (40 kilogram) emperor penguin, live in the Southern Hemisphere.</p> <p dir="ltr">Flightless and comically awkward on land, they spend the majority of their time in the water, and their bodies are streamlined for swimming.</p> <p dir="ltr">Keep clicking to see our favorite penguin pictures.</p> <p><em>—Text by Anna Lukacs, photo edit by Sherry L. Brukbacher</em></p>