Netflix has revealed a new trailer for its nature documentary series Secret World of Sound with David Attenborough.

As Attenborough says in the show, “the natural world is filled with sound, but so far we’ve been hearing only part of it,” and the Netflix series showcases those sounds.

In the documentary, advanced audio tech reveals never-before-heard animal behaviors: caiman chirping in eggs, lions and hyenas nocturnal skirmishes, puzzling fish humming, avian mimicry precision.

Here’s the two trailers for Secret World of Sound with David Attenborough: