Young fur seal pups and newly hatched barnacle geese face a relentless struggle for survival.

It arrives as an inevitable juncture—the instant every creature must venture forth, seeking its own solitary path to self-reliance.

Creatures require dwellings—places offering protection from harsh weather and sanctuary from danger.

An animal seeking influence must discover a path toward advancement within its social structure.

Join David Attenborough as he unveils the extraordinary rituals of courtship among flame bowerbirds and pufferfish.

This time, creatures are striving to raise their young.