I am in a nusing home and they have a huge cage with several different pairs of very small birds in it. a few pair are nesting and i am trying to find out how long it takes to hatch their eggs but i dony know what kind of birds they are. the first pair are a little larger than the finch type other ones. they i thought were some kind of dove. they are grey with black tipped wings a white tail and orange rings around their eyes can anyone help me with any info about them