They are often depicted as little green men or even monsters with ferocious teeth and claws, but there may well be aliens that look a lot like humans, a leading evolutionary biologist has claimed.
Professor Simon Conway Morris, a palaeontologist at the University of Cambridge, argues that life on other planets may well follow a theory known as convergent evolution.
This suggests species will independently evolve similar traits and features to solve particular problems presented to them by the environment.
