They'll chirp when they are happy. If there is noise in a room, if you're playing the radio or TV, your birds will keep up with the ambient noise. So, the noisier an environment, the more noise your birds will make.
Wild birds use vocalisation to warn others in the group about impending danger, such as a predator in the area. If a pet bird is afraid, it will do the same thing. Birds who find themselves away from the flock call to the group and find their way back when the group answers.
Chirping
This is a generally happy sound to reassure other birds in its immediate flock, though if there is a raspy quality to the chirps, the bird may be getting stressed or upset.
Yes, this does sound like hormonal behavior. A lot of pet birds get hormonal in the winter because of people having the heater on. The warmer temperatures stimulate the hormones. Other triggers are longer days, a lot of food especially fresh foods, and a safe place to nest.
Squawking. This is the noise no one – including the other budgies in your cage – want to hear. It means something is amiss. The bird may have been startled or frightened by something, he may be hurt, he may have sensed a predator (real or imagined), or he might just be angry because you haven't replenished the food yet ...
Researchers from King's College London found that people who reported being in the presence of birdsong or birds reported experiencing better moods, relief from depression and other mental health benefits for up to eight hours after hearing birdsong.
Alarm Calls: These sharp, piercing calls are used to warn other birds of danger, and birds will use them when they feel threatened. Alarm calls are typically short but loud and sharp and can carry over great distances. They are also often quick noises that can be repeated rapidly to warn of even greater danger.
Birds often bond to their human caretakers as flock-mates and will try to communicate with them as if they were also birds. Sometimes this communication is quiet chatter or recognizable human language (previously taught to the bird) that is socially acceptable to bird owners.
They will cuddle you, will come closer to you. The behaviour of closeness display that the bird has faith in you. Sometimes birds shake their tails to show their feeling of love to humans. They also sleep on you or on your arm, which means that they love you and have huge trust in you.
Signs your bird trusts you include: Your bird grooms themselves in your presence. Your bird vocally communicates with you. Your bird physically interacts with you.
Mites and Worms
Parasites such as Sternostoma tracheacolum mites (air sac mites) and Syngamus trachea worms can cause budgies to squeak. A bird infected by parasites may display additional signs and symptoms such as coughing, sneezing, and excessive saliva.
Behavior Changes
Other signs of grieving include changes in behavior like loss of appetite, unusual aggression, feather plucking and a change in sleeping habits.
For example, greet your budgie with the same words every time you enter the room: “Hello” or “Good Day” would work, or you can choose your own greeting. Ensure you place your face close to the cage and repeat the phrase regularly.
Beak Grinding
It is a sign of comfort. They are content and not causing themselves any harm by doing this. You can sometimes hear the little grinding noises from your bird's beak.
Bird Sadness and Grieving
There are many instances of birds expressing grief and even engaging in mourning rituals, showing that sadness isn't just a human state. It's interesting to note that birds exhibit many of the grieving behaviors we do: their posture droops, they appear listless, and often cry real tears.
If birds are left alone too often or for too long, they can start to scream because they have nothing else to do, and because it usually gets a human in the room to pay attention to them. Birds need a stimulating environment if they must be left alone for any period of time.