Almost all mammals take about 21 seconds to empty their bladders. Scientists conducted in-depth studies of different mammals peeing and   discovered that an animal’s mass, bladder pressure, and urethra size all work together in harmony with the gravitational pull and create the 21-second ‘law of urination.’ (, )

According to some 40-million-year-old bones that were found in Antarctica, penguins used to be over 6 feet tall and weighed more than 250 pounds. (, , )