E1 - Australian Forests

Aired: February 23, 2024

In ancient woodlands, a crocodile relies on sound to protect her babies, koalas release powerful roars, and an enchanting frog choir communes.

E2 - The Himalayas

Aired: February 23, 2024

Mountains act as a huge echo chamber for elusive creatures—like snow leopards—who use the landscape to amplify their rarely heard love songs.

E3 - The Rainforests

Aired: February 23, 2024

In one of the richest soundscapes, howler monkeys attempt to out-voice each other and sloths break their silence to search for mates.

E4 - The Pacific

Aired: February 23, 2024

Whale songs and dolphin clicks hold hidden meaning in an underwater world full of clever acoustic tricks.

E5 - African Plains

Aired: February 23, 2024

Predators listen for frantic footsteps, cocktail ants craft a battle cry, and lions embrace the transformative power of rolling rain and thunder.

E6 - Polar Worlds

Aired: February 23, 2024

In subzero conditions, emperor penguins use custom calls to find their families. After dark, the northern lights make mesmerizing music.

E7 - African Deserts

Aired: February 23, 2024

Silence may seem golden in the desert, but secret sounds connect curious meerkats—and tip off eavesdropping predators like cobras and eagles.

E8 - Atlantic Coasts

Aired: February 23, 2024

Where land meets sea, rockhopper penguins, orca whales, and elephant seals find incredible ways to cut through the chaos.

E9 - Winter Woodlands

Aired: February 23, 2024

In North America's forests, a snowy game of hide-and-seek unfolds between foxes and voles. When seasons change, elk strike up a sonic rivalry.

E10 - African Water Worlds

Aired: February 23, 2024

The Okavango Delta is awash with sound. And locals—from pied kingfishers to hippos—tune in to life above and below the water to survive.

E11 - Shallow Seas

Aired: February 23, 2024

New technology reveals a raucous symphony of pops and squeaks in an underwater amphitheater full of flirtatious fish and graceful manatees.

E12 - Listening to Our Planet

Aired: February 23, 2024

Meet the scientists studying sound around the globe to help stop the rapid progression of climate change and wildlife endangerment.