Male Red eared sliders have a thicker tail base and long claws used to help in mating also they have a slight indent on their tummies to again help with mating. Females lack these attributes, therefor they have smaller claws tails tend to be thinner at the base of their tail and no concave to belly. Obviously it is easier to tell if you have several to compare :). If there is any doubt be sure to supply an area where the turtle can haul out and lay eggs in subtrate or they may hold the eggs and suffer from egg binding a potentially fatal condition.
Boys have longer claws and a longer tail. Girls have shorter claws and a shorter tail.This is how I figured-http://www.Google.com/imgres?um=1&hl=en&sa=N&biw=1366&bih=611&tbm=isch&tbnid=EA6veBkk0sN1kM:&imgrefurl=http://habitataquarium.blogspot.com/2010/10/is-your-turtle-boy-or-girl.html&docid=g2zQRJaq5qoiKM&imgurl=http://2.bp.blogspot.com/_Jh1xVwav2qY/TMW5YEa7h-I/AAAAAAAAAJY/UWAny2ut9Hk/s1600/Turtle%252Bsexing_Blog.jpg&w=439&h=336&ei=qEsYUJ-cMoKk9ASizoCQCg&zoom=1&iact=hc&vpx=295&vpy=142&dur=4282&hovh=196&hovw=257&tx=92&ty=87&sig=116147117088115116409&page=1&tbnh=126&tbnw=169&start=0&ndsp=21&ved=1t:429,r:1,s:0,i:79
"Male red eared sliders have much longer claws on their front feet than females. As well, the tail of males is longer and thicker. The cloaca is located farther from the body in males, and males also may have a slightly concave (curved inward) plastron"
If the front claws are longer than the back claws then it is a boy, if not - a girl
By feeling its stomach if its soft its the girl if its hard or rough its a boy because they told me that ones and its not a lie.
Answer on the answer page test
by ya face
to see if a red eared slider is a boy or girl, look at the claws and tail. if they r long it is a girl. if they r short it is a boy. I know because I have two of them
flat bottom shell female, indented bottom shell male, he has to be able to stay mounted
YES
depending if its a boy or a girl a girl would keep her egg sack in the bottom of her shell but if its a boy he may be carrying the egg sack for the girl but not positive
female red ear slider have a much shorter tail then the male.
well the girl are big with short claws and the boy are small with long claws
uiovhy ui9ovhgfuidbn fjkdfdbfhyud
Usually the tail will tell you. Also the spots on the bottom of their shell, but the easiest way to tell is look at its tail. If it looks rather small and thin, it's a girl. If it's fat and long, it's a boy. -Chris
how do i tell if my my turtle is a girl or a boy?...
you cannot tell if the caterpillar is boy or girl
can you tell if a fish is a boy or girl by the tail