My cockatiel is 8 years and has always managed with the moulting seasons particularly well, however, this year he's been screeching whenever he is preening his feathers in a particular location on his back. At first I just assumed it was a uncomfortable feather growing through, however, it has now been just over 2 months and I'm starting to get concerned. There is no blood and gets a spray shower every 3-4 days. He is very defensive if my fingers around the vicinity of his back after he has agitated this with his beak. Interestingly, he only seems to do this after around 8pm when he starts to wind down, so it clearly doesnt bother him otherwise. Not sure whether someone has anything similar or advice here? I will resort to the vets if this continues for a few more days, just wondering how concerned I should be? Thanks!