aggressive and closed cockatiel

[biscuit]

Hello everybody,
My dear Kory hes start to behave strangely.
Most of the time he walking aroud in the house and tweets and when he wants silence that he could sleep, he tweet loudly.
But now he only sits below the water canister as shown in the picture and he is slightly more aggressive(bites me more often ).
I am afraid that somthing happand to him.


for the record, i start gave him month ago
Vitakraft African Parrot Food.
maybe he dont like it?
maybe he's cold?
maybe he is sick?

hope somone can help me.

Biscuit

 

[CeciliaZ]

Are you sure Kory is a boy? Maybe a female getting ready to lay an egg? Sitting on the floor of the cage is concerning. Please consider taking your bird to a vet.

 

[Tiel Feathers]

I was thinking exactly what @CeciliaZ was thinking. It sounds like you either have a female or your bird might be sick. Are there any vets in your area experienced with treating birds?