HOLY NATURAL SEX CHANGE, BATMAN!

[mr_j]

male frogs become female due to pollution

[monet2u]

it's not necessarily a bad thing.

[Phyllis]

haven't you seen jurassic park?

[Tracy]

and just in case you didn't know - from the WWF web site

Marine turtle's gender - not genetically determined
Male turtles stay at sea for all of their lives, and only females ever come ashore to lay their eggs on sandy beaches - usually the exact same beach where they were born. Unlike many animals, a marine turtle's gender is not genetically determined, but is dependent on the temperature of the sand where the egg develops. Female hatchlings result from higher temperatures, while males are produced by cooler temperatures. Different beaches and different positions in the nest can both affect the eventual gender of the hatchling.

[sam]

That's really strange. I found this on Roach's resume:

My gender - not genetically determined
I stay at sea for all of my life, and only ever come ashore to lay my eggs on sandy beaches - the exact same beach where I was born. Unlike many animals, my gender is not genetically determined, but is dependent on the temperature of the sand where the I develop. Females result from higher temperatures, while males are produced by cooler temperatures. Different beaches and different positions in can both affect the eventual gender.