No, there is no difference.
no they grow aggressive when there is a male in the breeding season
Both male and female emus have blue on their necks. It is impossible to tell the male and female apart by appearance alone.
running
If this is a reference to emus, both male and female emus have blue on their necks. It is impossible to tell the male and female apart by appearance alone.
Male hamsters tend to be less aggressive and protective than female hamsters.
First you select a male for your female; or female for your male. Put them in a room together, but if the female is aggressive or the male is it's best not to. When they want, they will breed and keep repeating until the female is pregnant.
A boy male
It depends. Is the male becoming aggressive? If it is then something's wrong. Males are usually protective of the females and pups (depending on breed) so if it is acting aggressive towards the female then it will hurt the puppy's. Other male dogs will be fine around the pregnant female but become aggressive towards the pups. Do your research on the breed to determine what is the best way to protect not only the female and pups but the male because the female will attack the male if he try's to attack the puppy's.
Male because it has testosterone which make it more agresive
Yes
yes, all of my hamsters that i have owned, the girls have been more aggressive
If the biting happens, the male may be aggressive, or the female has a scent of another dog that he doesn't like. It could also be an indication that the male likes the female.