If humans evolved from monkeys and apes, then why there are still monkeys and apes?

What the hell is the fourth thing from the right at the bottom of the evolution chart?

In case anyone's wondering: the primates on the bottom row are, from left to right: a lemur, a tarsier, a gorilla, a human, a chimpanzee, a urangutan, a gibbon, a babboon, and some unspecified old world monkey, like for example a vervet monkey
Edit: I was mistaken. When looking at the dates, he baboon seemingly symbolises all old world monkeys, and the monkey to the far right symbolises all new world monkeys

Some people just want to watch the world learn....

I wish we'd shared a common ancestor with cats and leopards rather than apes and monkeys. Just saying.