Are penguins mammals || Why is a penguin considered a mammal || Are penguins mammals or amphibians?

are penguins mammals, Penguins are a group of aquatic birds. They live almost exclusively in the Southern Hemisphere, with only one species, the Galápagos penguin, found north of the equator. Highly adapted for life in the water, penguins have countershaded dark and white plumage and flippers for swimming.<br /><br />are penguins mammals<br />Are penguins mammals or amphibians?<br />Why is a penguin considered a mammal?<br />are penguins mammals or birds<br />What is a penguin classified as?<br />