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You usually can tell by their tale if its longer its a male if its shorter its a female.
If it is a female the belly is darker
their bellies
the female frog will stare at the male a lot and mostly evry night you will hear the male bark like like a puppy
no you cannot
you can tell how to tell the gender by its under side if it is pale it is a female if it is dark it is a male.
Males have red stomachs
A male firefly has the"light" but the females do not
well a Male's tail is bigger than a females that is if you are talking about the bum breathing turtle.
males have longer tails
The easiest way is to watch them urinate - if the urine comes from under the belly then they are male if they squat and the urine comes from under their tail then they are female.
well a girl has a pinkish belly and boys have a bluish belly but it really depends on the type of fish. Other wise there usually the same.