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Flightless barnacle geese chicks face their greatest challenge at the very start of their lives.
The growing animals are developing new skills and learning how to survive alone.
In order to survive, animals need a place to live that provides the necessities of life, shelter from the elements, and a refuge from enemies.
How animals try to gain a position of power in their worlds, where the most powerful have the best access to food and water and are the most attractive to the opposite sex.
Competition to win a partner creates both the most extraordinary beauty and life-threatening violence anywhere in nature.
David Attenborough examines how animals raise their offspring.