Introduced Blue and Fiona today, carefully supervising the two girls. Both puffed up and kept vocalizing. Kept my arm between them as they tried to bite each other. After a while they would calm down and preen until,one remembered, hey, that other bird is new! Both carefully inspected Fionas two,week,old eggs. Then Blue would vocalize again, getting them both going again. The two girls in the next door cage also got involved. Lucy watched on impassively while Tracy flew around and flapped.Of course Lucy and Tracy took turns sitting on their three new eggs. Fiona jumped onto my arm repeatedly and would sit there until Blue would come up behind her. Then Fiona would go check her eggs, both would separate and preen, then the vocalizing would start again. After an hour, I got tired before they did. May put them in adjoining cages for a while to get to know each other. Will let them gradually get to be friends. Don't think I dare trust them together alone yet. Blue definitely isn't as tolerant as Lucy was (just, "thank God, another pigeon!"). Fiona looked pleased to have a new friend of sorts. Although I think she still fancies Tracy too. Amazing how much back and forth social interaction between the birds! Hope they stop squabbling for dominance soon.