A Bird's Egg

This morning I saw a bird's egg on my window sill outside. There was no nest no bird but an egg. I don't know much about bird's habits but my sense told me it was abnormal. And an egg couldn't have been layed there. be a bird in that environment. I was curious about what made the bird lay leaving the egg on a sill. I took a picture and sent it to my friend. She was felt surprised and interested interesting too. But she sent me back a photo of which was someone's hands was holding an egg. The egg had already hatched and a small snake was trying  tried to come out. The creepy photo made me feeling uncomfortable. All of a sudden I thought of the egg on my sill. Could it be a snake's egg? But I couldn't believe this denied myself quickly. It was impossible. In my mind a snake couldn't climb to the small, second floor sill and leave left an egg there. Thought of Thinking that, it made me more at ease. fell much easy.