We peeked inside the basket and to our utter delight viewed two newborn birds...
Mom was perched in a tree nearby, whistling loudly that we should get away from her babies! My husband is thinking they are shore birds known locally here as gackles. You'll remember last year we had a similar nest in a pine tree by our front door here.
I am thinking Mom returned but found the basket more convenient and maybe a little less work (I could relate--I am all for less housework myself!)
Look at the gorgeous blue of that little egg, isn't nature an amazing array of color and life?