Alien-looking creatures are living right here on Earth – you just have to know where to find them. We’ve searched the deepest oceans and the furthest corners of the Earth to find the strangest forms of life on our planet. Find out what science can tell us about the worlds that lie beyond the stars.

See: how cats, bats, fishes and birds evolved from the same ancestor
Explore: other solar systems in the search for alien life
Find out: how life can survive – and even thrive – in the deadliest environments