I have never heard of that happening. Usually they become the best of friends.
Female parakeet may be aggressive and sighted the bird as a territory threat or vice-versa. Female birds become anxious if they have eggs
It maybe felt territorial and felt a need to protect itself.
female
Maybe
sometimes
Depends on the male if it usually goes in the nest then yes
The female and male parakeet do a cloaca kiss and make a baby bird deedadee
you can leave them together all the time
I don't think so. I read that adult female parakeets noses are brown and that adult male parakeets noses are blue. But, young female parakeet's noses are "bluish" and a young male parakeet's nose is pink.
Probably when they are very affectionate with one another or you have baby parakeets.
Talk about your serious, Erection
you should look it up online and a whole bunch of pictures will come up.