Inside the ocean's hidden world of extraordinary biological transformations

The Sex-Shifting Fish | 4K UHD | Blue Planet II | BBC Earth · 5:53 · Video: BBC Earth · Watch at the source

In short: Explore the ocean's most remote and least understood regions through cinematic discovery. This footage reveals the surprising behaviors and strange characters that inhabit our planet's vibrant coral atolls and icy polar seas.

This cinematic journey showcases how our understanding of marine life has been transformed since the original Blue Planet aired in 2001. The series explores diverse environments, from the vibrant blues of coral atolls to the freezing waters of the Antarctic Ocean.

Viewers witness extraordinary behaviors, such as the sex-shifting nature of the kobudai, where a male waits within every female. The footage also captures giant trevally leaping to catch birds and the predatory actions of the hammerhead shark.

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