What bird egg is this???

[Windrider]

Okay. I know that if you touch a baby wild bird the parents will reject it because of the human scent. But I don't know about the egg.

This is not true. Birds have a very poor sense of smell (except those feeding on carrion, such vultures). I think this myth got started because mammals such as squirrels WILL reject handled babies. Here is a link where the Audubon Society suggests returning fallen nestlings to the nest, and these people KNOW birds. I am sure it would be the same with eggs.
http://audubonportland.org/wcc/urban/babybirds

Other than putting the egg back, I am not sure that you can hatch it without an incubator and knowing the proper settings. Just like folks here who raise quail, chickens, and exotics will tell you that each species has different settings for the incubator, so you would have to know that info for whatever type of egg you found.

 

[Chickerdoodle13]

If you can find the nest to put it back, that would be the best in the case. Baby birds can be difficult to raise from day olds and it is actually illegal to do so in the United States if it is a native species. The only species not protected are feral ones such as starlings, house sparrows, and pigeons.

At this point, the egg may have already begun incubating and may be dead. It's also possible the egg was tossed by the parent because it was dead. Birds can tell when an egg is no longer alive due to temperature differences within the egg.

If you were to incubate it and the egg is dead or rotting, you could introduce bacteria into your incubator or have an egg explosion. It's just not worth the risk, IMO. I also know from experience that it is very difficult to raise and release a single bird back into the wild. They tend to get too attached to people.

 

[Chickerdoodle13]

And yes, the story about the parents rejecting baby birds or eggs is not true at all. As the previous poster said, most birds have very poor senses of smell. I truly believe that story was made up to prevent children from touching baby birds they found (I was too sly as a child and knew better than to believe that story, much to my parents' disapproval!