Blue Planet II: what have we learned so far?

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 biggest discoveries It is testament to the number of spectacles packed into Blue Planet II that the strategic change of gender a giant wrasse is – scientifically speaking, at least – one of the least remarkable. Changing gender, or sequential hermaphroditism, is a fact of life for more than 400