What is going on with pearl birds always open mouth

Pearl birds often open their mouths because it needs to dissipate heat.It is best not to let it expose the sun for a long time in summer.It is best to put it in a better ventilation place, but you ca n’t immediately blow off after taking a bath. You must dry it first, otherwise you will have a cold.It is best to cover it with a cage cloth at night to prevent the bite of mosquitoes.Daily feed and drinking water are replaced, and the bird cages are cleaned to keep the environment hygiene.