Close up shot of a wild white-throated laughingthrush, pterorhinus albogularis spotted perching on tree branch with its plumage puff up, the bird with serious feathers loss in neck area

white throated laughingthrush bird species pterorhinus albogularis feather puff plumage unhealthy health condition poor disorder animal birdwatching park zoo scruffy symptom deficiency disease virus infection neck bacteria preen cage loss pluck moult stress sick ill environment problem viral destructive behaviour excessive abnormal skin damage mate patch bare perch branch care