A half-male, half-female butterfly has hatched at London's Natural History Museum.
A line down the insect's middle marks the division between its male side and its more colourful female side.
Failure of the butterfly's sex chromosomes to separate during fertilisation is behind this rare sexual chimera.
Once it has lived out its month-long life, the butterfly will join the museum's collection.
Only 0.01% of hatching butterflies are gynandromorphs; the technical term for these strange asymmetrical creatures.
"So you can understand why I was bouncing off of the walls when I learned that... [it] had emerged in the puparium," said butterfly enthusiast Luke Brown from London's Natural History Museum.
Mr Brown built his first butterfly house when he was seven, and has hatched out over 300 thousand butterflies; this is only his third gynandromorph.
Gynandromorph
Gynandromorph
No, it's not a new Red Dwarf episode...
“If you trust in yourself, and believe in your dreams, and follow your star. . . you'll still get beaten by people who spent their time working hard and learning things and weren't so lazy.”
Re: Gynandromorph
*sigh* 24 Genders... 
Why is it that when Miley Cyrus gets naked and licks a hammer it's 'art' and 'edgy' but when I do it I'm 'drunk' and 'banned from the hardware store'?
Re: Gynandromorph
If a man speaks in the forest and there are no women around to hear is he still wrong?
Re: Gynandromorph
I'm still not really sure what it is - but it is a big name on British TV at the moment (which says an awful lot about the Brits)
If a man speaks in the forest and there are no women around to hear is he still wrong?
Re: Gynandromorph
Ah, so it is a 'he'. I knew the name, but wasn't sure if a 'Gok' was male or female
If a man speaks in the forest and there are no women around to hear is he still wrong?