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Sorry, i don't have the full sized pictures, and don't want to disturb the zebras again to get more pictures.
I used Adobe Photoshop to crop the pictures and touch them up, and after previewing them before posting, they were far too blurry to use full size, so i have resized them again for normal web viewing
Hopefully they will give a possible indication to sex ?

Bottom Tank Zebra A;




Bottom Tank Zebra B;




Bottom Tank Zebra C;




Bottom Tank Zebra D;




Bottom Tank Zebra Male;




Top Tank Zebra A;




Top Tank Zebra B;




Top Tank Zebra C;




Top Tank Zebra D;




Top Tank Zebra Male;

Wow, quite a task you've presented us with here

Ok, I'll start by telling you which ones are the females:

Bottom Tank Zebra C - ready for some courtship too I believe

Top Tank Zebra B;

Top Tank Zebra C;

You have identified the males yourself, so that leaves:

Bottom Tank Zebra A; looks like a young male

Bottom Tank Zebra B; looks like a young male

Bottom Tank Zebra D; Looks like a male

Top Tank Zebra A; crecent shaped fins, but fin looks too thick to be a female.. I would still guess young female - I think... and

Top Tank Zebra D; which I think is a male


Hope I managed to keep track of them all

And as usual - I've been wrong before...

Thanks McEve
It's good to have someone more experienced look at them.
I had written down mostly males in each tank, apart from Zebra C in the bottom and top tanks, but was mainly going on nose shape.

As long as there is one female in each tank !

Bottom tank
A:Young male?
B:Female
C:Female
D:Female

Top tank
A:Male
B:Male?
C:Female
D Male