This is the moment of truth. The moment Barnacle Geese youngsters have to leap 400 feet down a rocky cliff in Greenland to join their parents and start the rest of their lives.
Make the wrong kind of jump and you will be smashed on the rocks. Get it right and manage to hit the cliff edges stomach-first on your way down and you might – might – just survive.
And all this within the first few hours of being alive.
This is one of the most thrilling – and upsetting – sequences in Life Story, the new David Attenborough series that took four years to make and examines the early days of life for a variety of the world’s creatures.
Watch it here.
Life Story begins on BBC1 on Thursday at 9pm