Bettongs: back from extinction

Habitat loss and predators drove bettongs to extinction from the Northern Territory in Australia over 60 years ago.

Little by little, scientists are re-introducing these tiny ecosystem engineers.

Read more:

Latest videos

Why whales sing

1:31
Video: Why whales sing

What causes rainbows?

1:32
Video: What causes rainbows?

Microplastics and climate change

2:09
Video: Microplastics and climate change