How do you tell if molly's are male or female?

i have four molly's i know two are female because their pregnant but i don't know about the other two!!!
Answers:
Well, if you look beneath the fish, the females will have a very round body whereas the males have a pointed anal fin under their body. Search on google.co.uk for images
:)

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What is a molly? LOL

Whatever they are, you know at least one of the other two is male since you have 2 preggo ones!

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Look at the bottom fin it front of the poop drop hole. The male have a slim fin like a "Wanger" and the females are more full. Best I can explain. Many live bearers are like this; Sword-tails, Platties and Moons etc., but, not all.
Female; http://www.goliadfarms.com/images/fish/l...
Male top and female below; http://republika.pl/blog_fc_579584/10547...
Just look at that bottom fin and you will see, reguardless of "Type" of molly.

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Here's a picture of a male molly:

http://badmanstropicalfish.com/sbs/liveb...
and a female:
http://tropicalfishgallery.com/species-g...


Look at the bottom rear fin. In the male it's pointed and thin, in the female it looks like normal fin. That's the best way to tell them apart.

MM