I have a bird called Chickadoodle. Chickadoodle is the sweetest, most calm and laid back budgie ever when she's in a normal mood. When she becomes hormonal and broody, she changes, a complete Jekyll and Hyde transformation. She will regularly and consistently draw blood, she will bite me so hard and refuse to let go, she becomes entirely fearless and laser focused on one thing and one thing only: defending what she perceives as her territory (my shoulder, inside my shirt, wherever). It is a deeply unpleasant experience.
Once she's in this hormonal state, it strains out bond and makes spending any time with her absolutely dreadful. Instead of letting her perch on her regular spot on my shoulder and peacefully sing, I've got to keep shooing her off because when she's hormonal, she'll attack over and over if I don't shoo her away from me. Then you've got the whole egg laying aspect which just puts them through unnecessary risk of egg binding. It also puts a lot of pressure on her relationship with her female friend, as she'll try and fight her too. It just creates a super uncomfortable environment for everyone except the one being a hormonal jerk.
I've currently got multiple bite marks on my hand, a couple on my ears, one on my neck. They're all deep enough to puncture the skin and draw blood. I've learned my lesson and will do everything in my power to avoid getting her hormonal (this most recent bout of hormones is my fault as I was petting her a week and a half back).