First, let's answer the question of what hyperkeratosis is. Hyperkeratosis is an abnormal thickening of the outer layer of the skin. If your bird has hyperkeratosis, you can easily spot them on their cere. I've seen many female budgies having them, but it can also affect males. Some parrots only have them on their cere, but your parrot can also have them on their feet. With female budgies (depending on their mutation), you can easily spot them on their care since they tend to have a crustier cere than their male counterparts.
