Inside the life of the kobudai, a fish that changes its sex

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

In short: This cinematic journey explores the ocean's most mysterious corners, revealing extraordinary behaviors and species that challenge our understanding of marine life, from Antarctic octopuses to leaping trevally.

The video explores the remarkable biological transformations found beneath the waves, such as the kobudai, a species where every female is accompanied by a male in waiting. By showcasing rare footage from diverse habitats—ranging from icy polar seas to vibrant coral atolls—the series highlights how our scientific understanding of ocean life has evolved significantly since the original Blue Planet aired in 2001.

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