Billy the pygmy hippo. Calvin Coolidge loved animals. If he lived today, you’d likely see him on an episode of Animal Hoarders. He had six dogs, a cat, two lions, a goose, a bobcat, an antelope, a wallaby and a raccoon named Rebecca he would take for walks on a leash. He could’ve easily raised millions for government funding by charging admission to his private zoo, but he didn’t. And when word of his collection found its way to the ears of Harvey Firestone, Billy the pygmy hippo came to the White House. Harvey Firestone was the millionaire mogul at the helm of Firestone Tires. He found a baby pygmy hippo roaming around the desolate plains of Liberia, and for some reason, decided to keep him (probably because of how unfathomably cute he was!). But Billy wasn’t cute anymore; he was 600 pounds and over six feet long and in addition to being a handful, he was too expensive for even a millionaire to feed! He presented Billy as a gift and the president graciously accepted. The president kept him for the duration of his presidency, and then donated him to the Smithsonian National Zoological Park because pygmy hippos were severely endangered at the time. Billy turned out to be quite the virile little pygmy hippo, fathering 23 baby hippos in all—making almost every hippo inhabiting zoos in the US today traceable to his genes.