Courtesy of Lehigh Valley Zoo Pygmy goats are a breed of domestic goat that stay small and stocky. They stand less than two feet tall and weigh 45-60 pounds when fully grown, the zoo says.

Officials said that fully grown pygmy hippos can weigh up to 600 pounds (270 kilograms). According to the Richmond-area zoo, pygmy hippos are an endangered West African species, and only 2,500 ...