The pygmy hippopotamus, now 6 months old, is Thailand’s biggest celebrity, and the crowds keep flocking. What explains her charm?

Shedd Aquarium has named its two newest rockhopper penguins, Pico and Douglas, nods to their South American roots and the Falkland Islands’ penguin population, respectively.

These images from the Smithsonian Magazine Photo Contest show just why penguins have waddled into our hearts ...