I came home from work today and my blue and gold macaw is abnormally quiet. Normally he wants out of the cage to walk around; today, he eventually came out after some coaxing, but went back in within a few minutes. He's being abnormally quiet, and I can hear a low moaning when I pet his head. He is molting. He's eating some grapes and nuts, and drinking water. I'm concerned because he's not acting like himself.