This Week: The Amazon River's Coral Secret

The mighty Amazon River has been hiding a secret that biologists have now revealed.Beneath the muddy waters, where the river meets the Atlantic Ocean, lies a unique and massive coral reef ecosystem. It stretches across thousands of kilometres and no-one had suspected it was there. We'll find out how we missed it, how it survives, and what might threaten it in the future.

Plus - baby dinosaurs with adult proportions; and a plant that attracts ants to fend off attacks from beetles.

Click here for full episode, individual segments, streaming audio, MP3 downloads, and related links