Topic: life cycle

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Why the Giant Sequoia Needs Fire to Grow

Giant sequoias, the planet's largest trees and among the oldest living things on Earth—many of the largest are over 3,000 years old—depend on fire to help them reproduce. Learn how a destructive force is necessary for...

What happens to a caterpillar inside its chrysalis?

From egg, to larva, to pupa, to an adult, watch as a Heliconius caterpillar (a larva) transforms into a butterfly. This clip from Micro Monsters with David Attenborough: Courtship includes a digital look at what goes ...