What birds have wings but can't fly? Penguins Instead, these adorable animals use their flippers to swim in the deep, cold water. Meet the different species, from the Little Blue to the Emperor, and find out about their feathers, their coloring, and their habitat-as well as how they build their nes[...]

From boiling heat to bone-chilling cold, from the driest deserts to the darkest caves, from the tallest mountains to the deepest seas: these animals survive in the most extreme environments imaginable. Meet these incredible creatures, including polar bears and penguins that endure freezing temperatu[...]