Did you know that Penguins Used to Be Six Feet Tall🐧 Those tiny tuxedo birds we know and love today used to be the size of a high school linebacker. According to a 2017 report published in Nature Communications, there's evidence that extinct Kumimanu biceae penguins once stood close to 6 feet tall and weighed more than 200 pounds. Source: 10. https://bestlifeonline.com/awesome-facts/