By Kelly Murray, CNN What would it take to change sexes? In
humans, it involves complicated surgeries and rigorous hormonal
therapies, not to mention hefty social and psychological
ramifications. But in the Eastern Pacific Ocean, tiny orange-
and-blue fish are naturally transitioning from female to male,
and male to female, all the time. Bluebanded goby fish, about 2
to 2.5 inches long, are able to change their sex when it suits
their position in social hierarchies.