Were cannibals real?

Cannibalism was practised in various places, notably Papua New Guinea.

Yes because they couldn't last and had to eat people. Most of the animals were extinct.

In most places cannibalism was performed for ritual reasons. Usually it was done under the guise of the person eating the flesh assuming the strength of the person or persons being consumed. It was rarely done as a day to day act of subsistence.

they think human flesh is very yummy and have an addiction :)