Blue Planet II: from octopus v shark to fish that crawl, the series’s biggest discoveries

The documentary’s marvels are not just new to television – many are new to science as well. From hyper-intelligent fish to the origin of life itself, we round up the series’s breakthrough momentsIt is testament to the number of spectacles packed into Blue Planet II that a giant wrasse’s strategetic change of gender is – scientifically speaking, at least – one of the least remarkable. Changing gender, or sequential hermaphroditism, is a fact of life for more th