The difference between a male fish and a female fish is that the female lays the eggs and the male fertalizes them when she leves. But scientist really don't the main difference. One has a vagina and the other has a penis.
The difference between a male donkey and a female donkey is their reproductive organs and their names. A male donkey is referred to as an ass or jack and a female donkey is referred to as a jenny or jennet.
The difference between the male and female killer whale is many things first the male killer whale or orca is that it weigh's more than a female and second is that the female tale is half as long as an male and last but not least we all know that the female has to have babies but not the male.