diamond sparrow health

[sharath1]

hello i bought a pair of diamond fire tail last week, both had lost a few feathers on there head near the beak or nostrils can anyone help me with this problem. female has a pinkish red beak and male has a bark red beak but both male and female do make a call like voooo vooooo vooooo just like a ambulance siren, i want to know does both male and female make call or sing or only the male sing thank you