You can tell an adult female from a male (and vice versa) by the difference in the size of it's dorsal fin, and males have notably bigger jaws. At a juvenile age, however, distinguishing the two is much more difficult.
Light coler fish is a girl and dark coler is a boy
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It depends on the species. Some can't be distinguished by external appearances.
female fish put rocks in there mouth and move them around
the way you can tell if a dolphin is a boy or a girl is by there dorsal fin the male dorsal fin is wider and taller than the females
you look under nefe it and see if it is a boy or a girl
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
its harder for a boy to tell if a girl likes him
YOu can not tell the difference between a girl or boy starfish.
by asking its mother if it is a girl or a boy and plus you can tell by the face
you can tell if its a girl or a boy byits butt or eyes. if its a girl, it will have small pupils. if itsa boy, it will have large pupils.
i don't know if it is a boy or a girl
It can be either way, a girl can tell a boy that she loves him or a boy can tell a girl that he loves her.
You can tell by the tail if the tail is short than its a girl if the tail is long its a boy!
You can tell whether or not your rabbit is a boy/girl by looking under its butt.
If you have a penis your probably is a boy.