in 1956, the zoo welcomed elephants rani and indra. four years later, chimpanzees joined the group and 19 years later, 2 baby lions were born. after the birth of seven cheetahs, the zoo opened a savanna area known as de ark van amersfoort (or amersfoort's ark). today, the zoo is home to more than 100 different types of animals and sees more than 600,000 visitors each year.