Little Nest by the Ledge

There's a nest sitting in the corner of my windowsill. From what little I've read about nesting, this one is called a CUP, a nest woven in a circular pattern, out of grass, leaves, string, hair, saliva and mud to help hold it together. Birds are really not above man when it comes to architecture! My nest builder is likely an enterprising Robin, who, by the way, I have not heard pecking yesterday.

The nest has 4 eggs in it, and the momma bird sits there most times. However, it was thundering really bad about two nights ago, so my husband, thinking to be a good fairy godparent, went out there to give it cover of some sort, and sprinkle a good amount of birdseed (our lovebirds died) on the ledge. What do you know, momma bird flew away as soon as he got close enough. AND that was two nights ago.

We've been waiting for Mrs. Robin since. Yesterday morning, we found a dead ground lizard (my son says dinosaur) close to where the nest is and I am just so worried the momma of that creature might come looking for it and see the eggs instead.

How long before these little chickies hatch to become fully flighted aviators? How sturdy is this little nest to last them while they incubate, and to protect them from predators? We have plenty of tree squirrels and crows roaming the area, and also an occasional cat. Oh, Lordy.

I hear a lot of singing outside now, I guess I'll check it out. In the meantime, any information on missing robins will be highly appreciated.

Thank you all, and good morning!