Just like people, all parakeets have different personalities. Despite this, they share certain behaviors. This is just as well, as knowing what’s normal behavior and what’s not is crucial in determining whether everything is ok in your cage or aviary.
Parakeet Behavior, Male and Female
In general, there are no big differences in the behavior of cock and hen birds. They both feed, chatter and socialize in the same way, and both can be either passive or aggressive depending on their mood, personality and circumstance. Hens have louder and more shrill voices than cocks, and tend to squawk more too. Females are also less inclined to learn human words - although it is not unheard of for female birds to talk too.
During the mating season - a vague concept, as in captivity this can be almost any time of the year - both sexes become more aggressive and territorial than usual. Females are often more sensitive in these times of surging hormones, so don't get offended when your usually placid bird suddenly attacks your hand. Thankfully, their beaks are no sharper during this time of the year so there's little danger of any bloodshed. These “mating seasons” usually last anywhere from three to six weeks.

A pair of Texas clear body parakeets in peak mating condition
Naturally, hormonal birds feel a need to mate, and if there's no mate available, toys, food or even your hand may become the center of its sexual attention. This instinct can usually be discouraged by putting your bird back in its cage and perhaps removing mirrors and potential nesting spaces.
Parakeet Behavior When Hot
A parakeet that’s feeling overheated will slightly raise his wings when perching. The feathers around the cere (nose area) may also be raised. If he’s very hot he will open his beak to pant. Always make sure there is a shady area in your birds’ cage so they can cool down.
Parakeet Behavior When Cold
On the other hand, a bird that’s feeling cold will sit huddled up on his perch, with his feathers fluffed up. Move them somewhere warm, or if your birds are outside, provide some warm shelter or switch the aviary heater on.
Rita, 13 March 2020
I've had my female budgie 5 years shes never been a social bird ,recently shes started squeaking when I go near cage I talk to her to calm her down and she hardly chirps shes eating drinking and playing ok .I have not frightened her in any way I love her to much but I'm concerned about this noise ,she lost her mate about 7 month ago