Is it illegal to incubate an egg that has been abandoned inside your yard?

It depends on the species of the egg and the location of your yard. In many places, it is illegal to possess the eggs of wild birds or animals without a permit. In addition, some species are considered to be endangered or threatened and it may be illegal to disturb their nests or eggs. Before incubating an egg, it is important to research the local laws and regulations regarding wildlife and protected species.