Some like it fluid: The animal kingdom's wildest sex changes

So, what’s the deal with animals swapping sexes? Why do they do it and what can we learn from it? Let’s take a closer look at some of nature’s most interesting identity changes...

Blue Headed Wrasse or Bluehead Wrasse, (thalassoma bifasciatum).

Nature has never been one for strict rules, and when it comes to sex and gender, the animal kingdom is full of surprises. 

Forget rigid categories, some creatures can switch sexes when it suits them, others are born with the ability to play both roles, and a few even rewrite the rulebook entirely. I