Can Nanday Conures be trained to minimize/lower their screeching vocalizations?
something i would add, is, if your conure is screaming all the time, to just get your attention and if he/she then gets quiet when you go over to the cage, then they are going to learn that if they scream like that, then someone is going to come over and pay attention to them. You don't want to have them pick up on this little habit, and if so, then both the bird AND the owner needs some training, lol.
If this is the case, then only go to the cage when the bird is either quit or when he/she is doing a little noise that you like, and make sure to praise the bird and take a piece of fruit or sunflower seed, something that you know your bird will LOVE...Then after he/she eats it, walk a few steps away from the cage and face the bird, but if it starts screaming again, then turn around and give your back to the bird and don't go back to the cage to praise it or give it another piece of fruit, etc until it's quiet or like i said, doing a noise that you find acceptable, and you are going to have to repeat this a few times a day for maybe a few days, until he/she picks up on the fact that screaming won't get him/her anywhere, but being quiet or doing that certain little noise that you like, will get attention that he or she wants.
Conures like most parrots will call loudly in the evening and morning to talk to their flock. This is a wild behavior that isn't really modifiable. Like a dog barking for warning or a cat purring when content - its a behavior that comes with owning a bird.
If your bird is yelling all of the time. Something is wrong. More than likely its not the bird that needs trained, but something in the environment needs changed. The bird may feel neglected, bored or depressed. Does your Nanday have enough toys? Is the cage too small? Is the diet adequate? Is the bird getting enough attention? Is the bird stressed by some object close to its cage? Is the bird unwell? These are questions that need to be asked and modified in order to help minimize the screeching.
If all seems to be well and the bird is still screeching loudly all of the time. Try a simple step I often advise parrot owners of: lower the volume of your home. If everyone in the house is yelling or speaking at full volume, the TV is loud or the radio is always turned up. Your bird will be loud. It may be stressed by the noise, or may simply be trying to fit in to its surroundings. Parrots like to be heard. They will raise volume to be heard.
Last of all, some birds are loud. Nandays are one species that is considered loud. Even when they just want to talk it usually isn't quiet. Just like all people have different volumes of speaking, so do birds. Even among the same species, individuals can have more volume than others.
One thing you can do to make evening and morning vocalizations more tolerable is to communicate with the bird in a quiet voice during this time. When your Nanday starts to yell at night. Walk to the cage, let them know you can hear them. Say Hello, sing a song, tell them about your day. The parrot screech is how these birds communicate, it comes with the territory.