The cowbird likes to lay it's eggs in other birds' nests, being the lazy parent that it is. This cowbird has laid it's large, brown speckled egg beside the delicate blue sparrows' eggs. I spent a long time trying to interweave all the twigs together to portray a nest...I can't imagine how the birds do it and not have the whole nest fall apart! I read recently about a man here in TN who is making eggs of all the birds known today...with clay! He is quoted to say that the birds are so hard to emulate that he has had to build a special tool that makes the clay eggs as precise as possible. So far he has created, fired and glazed over 8000 eggs! I hope to visit his studio sometime to see his work. That is dedication!