Bosco started doing a little hopping dance on a perch, she was squeaking a little, and then she squatted down on the perch and vibrated her tail up and down. These are all signs to males that she is ready to mate. Tea was watching the whole while, singing snippets of his Hunka Hunka Burning Love song, and he hopped right over to her and on top of her back when she started vibrating her tail. The actual mating act between Society finches is pretty quick, but still, Bosco and Tea weren't quick enough. Sally (of all birds) flew down to the perch to watch, then Frank flew down to watch, and Bosco and Tea, flanked by White-headed Nuns, stopped what they were doing and went off to do something completely different.