Yes I agree with above. We don't know what would trigger hormonal aggression in our birds. For example, I have a wooden tunnel hanging on the ceiling of my sun conure's cage similar to how you set up your sea grass mat. It never triggered his hormonal aggression and he's had it there for over a year. What did trigger it though is me leaving a roll of toilet paper for him to shred. He really got into it, and I thought it was fun and games. Within a month of having it in the cage, I witnessed a string of the worst hormonal frenzies ever - and Boomer is usually manageable in this regard. I took it out and I noticed a difference. Took me a while to realize it though. My vet agreed and said the obsessive shredding he did to the toilet paper rolls triggered nesting behavior.