Sting rays (not the car) have two distinct genders.
they look the same
No male duck will ever turn into a female duck.
Yes, in spring when there are no female frogs, male frogs turn themselves into female to breed.
Female rats don't just turn into male rats. Sometimes a male rat's testes will be withheld in his body as a result of stress and he will appear to be female. Of course in such a situation, he is still male.
Yes a parrot fish female could turn into a parrot fish male it changes gender and color :}
Stingrays mate by which a male stingray follows the female stingray closely and bites at her pectoral disc. Some males also possesses bite wounds but they are much less common compared from the females.
goldfish start out with female and then turn into male!!!!!!
a female stingray can have about to 5 or 6 baby stingrays
No the egg turns into a female togepi
clownfish are all born males and the dominant male of a group will turn female when the female of that group dies.
Yes!
Yes. Female humans can get moody when they are in season and so can female dogs.