👉 Macrodactyla is a group of mammals that have large bodies, long bones (called femora), and four sets of digits. These include the big toe, which is the dominant digit, the second foot (the "second metatarsophalangeal joint"), and the third foot (also known as the "third metatarsophalangeal joint"). This group includes some of the largest mammals on Earth, such as elephants, gorillas, and chimpanzees.