[Ghanwa Asim]

I had male lutino hand tamed cockatiel previously, He was calm and friendly. Yesterday I brought a grey and white 4 months old baby cockatiel! He/She hisses and tries to bite whenever get closed to! Please lemme know how to hand tame it and what's its gender! And if it is female! Will it whistle or not?

 

[Smerft85]

I'm going to lean toward your bird being female based on the small amount of pattern I can see in the tail feathers. Females whistle and make noise sure, but they typically dont sing or talk like a male does.