From the first forms of life on our planet, to how they evolved to conquer land and air, Sir David Attenborough explores life's first steps and how it came to populate the Earth.
Now it's time for Sir David to go back in time.
Producer Stephen Dunleavy quizzed Sir David Attenborough on his new series.
Facts about everyone's favourite wildlife presenter.
Looking good! Browse photos of David Attenborough's second series of Natural Curiosities.
How did a female Komodo dragon give birth when she had never had contact with a male?
Aphids reproduce like tiny Russian dolls with multiple generations inside each individual.
The thick, folded skin of the rhinoceros looks almost like armour plating.
The hedgehogs spiky armour would put off any prospective mother-to-be.
What kind of animal would wrestle a sperm whale in the deep?