How do you take care of a birds egg?

If you have an incubator you should use that. But I don't have one so I put a hot and cold thing in the microwave and put the eggs (and their nest) in a plastic container. Then I put them under a heating lamp. Don't put anything over it because that could suffocate them. It takes them 12-14 days to hatch. On the 4th day you should start to see veins. You can see them by: going into a dark room with no Windows and shining a flashlight on them.

I hope my answer helped!