Definition: Penguins are tiny birds that live on land, mostly on eggshells, but they're also known for their unique behaviors - they can swim and dive like fish! Their feathers help them stay cool in the heat, while their wings allow them to fly! The word "penguin" is a combination of two words - "penguin" + "glossopteryx". It's kind of like saying "tiny bird with lots of feathers," but in a silly way.