I have a male GCC, Chico, that we bought at a pet shop about 6 weeks ago. He was NOT at all tame or trusting but has come a long way. That's another story. I also have a zebra finch pair in a small cage and a much larger cage with a canary pair and society finch pair. The female canary is nesting in a seed dish (sigh... she does have other options) and Chico seems obsessed with her. He will cling to the side of the cage at eye level with her. She has no fertile eggs and I know she's still receptive because the male canary tries to breed her. Any idea whether Chico may know this too? There are days I have to shoo him away almost constantly. If he is not eating, or on me, he's after her!