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 • Basic Overview
The Ice Age
By the time the Quaternary Period began nearly two million years ago, the continents had moved to their current positions, and massive glaciers had formed at the poles. Earth had entered an intense ice age that continues today.
The changing climate affected mammal diversity.
Big, better-insulated bodies are an advantage in cold climates, and during the ice age, many mammals evolved to be massive. These mammals spread across the globe as new land bridges connected continents.
Humans moved among them, affecting other species in ways that would soon change the planet forever.
Life on Earth was starting to look like life today.
Continue to The Great Join Up. >>
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