Earthsounds

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

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

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

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

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

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

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

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

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.

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

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

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