my brothers pair of Zebra Finch's had two clutches of eggs each time it was 5 to 6. After the second clutch the male turned on the female and killed her. so we put in one of his daughters who he killed and the others died of illness. we have the father and one son left. o ya we gave away the first clutch. not very good for any number needed to feed even a kestrel for more the a week.