1. Chimpanzees: Includes both common chimpanzees and bonobos.
2. Gorillas: Includes both western and eastern gorillas.
3. Orangutans: Includes both Sumatran and Bornean orangutans.
4. Humans: Yes, humans are considered great apes!
It's important to remember that "apes" is a broad term and includes many other species beyond these four.