It is rare for this to happen, but it may be because of terrotorial dispute. Or the male may have refused to help take care of the babies and the mother may be fed up.
Female parakeet may be aggressive and sighted the bird as a territory threat or vice-versa. Female birds become anxious if they have eggs
I have never heard of that happening. Usually they become the best of friends.
It maybe felt territorial and felt a need to protect itself.
They can but i still think that the rat would attack the parakeet the parakeet would obviously poke its eyes out
female
Maybe
You cant the male would kill the female unless you have already a female then the female would kill the male
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.