American Robin - Nest

A pair of Robins decided to build their nest about ten feet from one of my windows this Spring. I thought they might give up since it was hard for me not to disturb them given it was near my front entrance. I did my best to avoid bothering the sitting female as much as possible while still following what was going on. In the end it turned out to be a failed attempt as something ultimately raided the next and removed all but one partly incubated egg which I later found on the ground. My guess is the culprit was likely a Blue Jay since there have been several in the area.