blogs.discovermagazine.com — Adélie penguin chicks chase an adult. Penguins are undeniably adorable. What other animal waddles around in a little tuxedo? But don't let that cute exterior fool you: on a 1910-1913 Antarctic expedition, surgeon and zoologist George Levick bore witness to some surprising sexual behaviors of Adélie penguins, including coerced sex and necrophilia.