So, it's spring and our Quaker has gotten all hormonal. His favorite playpen sits in a box with high sides that I made to catch crumbs, etc and now he appears to be turning it into a nest. He is stuffing emptying seeds and bits of paper in the gap under the playpen base and the box floor, and makes this loud gurgling squawk. I don't know what to do now, I'm worried if I remove the box he'll be sad and think he was a bad bird. I tried doing it who he was in eyesight and he just gazed at it sadly (the box) like he was so puzzled as to why I took it away. What should I do? He is noticeably more aggressive since the "nest" building started but it keeps him so busy and happy.