Macaws are very large often colourful New World parrots. Certain macaw species celebrate the rising and setting of sun with their squawks and songs. Screaming is often used to warn the flock of imminent danger. At your home, if your pet macaw is scared of something or someone, it may do the same thing. This is normal and will last for a short period of time. However, if your parrot screams ceaselessly then you may have a problem. Macaw Parrots are very vocal birds. Macaws use vocalizations to communicate with others. They usually live in flocks because they feel safer. Other reasons for being in a flock include the chance of finding food easily and socializing. When macaws communicate with their flock they have to be audible enough in the continuous singing and squawking of the rest of the birds.