|Typical human evolution by natural selection chart|
One of the arguments given against evolution is "If humans evolved from monkeys. then why are there still monkeys?".
To start with, Darwin didn't state that monkeys are the direct ancestors of human beings in the evolutionary context. This misconception dates back to the case of John T. Scopes, who was prosecuted by Tennessee state for teaching human evolution in the famous Scopes Trial, where the claim was raised by the prosecution attorney to gain public support.
Nevertheless, below an infographic from the Berkeley's 'Understanding Evolution' page that explains this nuance.
(as seen on Moniks: Unleashed)
Monkeys haven't evolved like us, simply because humans didn't evolve from monkeys but from a common ancestor, if anything we evolved with them.