These bird siblings will do anything for their brothers and sister chicks in the nest, even when a snake invades their territory.
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The Trials of Life
This is the third in Sir David Attenborough's epic Life series, following on from Life on Earth and The Living Planet. It begins with the ways in which animals arrive in the world and ends with the extraordinary techniques they employ to reproduce. In between, there are the other trials we all have to face: building a home, finding food, rearing children and getting on with friends and rivals.
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