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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 ancient woodlands, a crocodile relies on sound to protect her babies, koalas release powerful roars, and an enchanting frog choir communes.
In one of the richest soundscapes, howler monkeys attempt to out-voice each other and sloths break their silence to search for mates.