n2gzs:The robins are quite prolific around our house this year. I witnessed at least 5 different nests produce offspring. Two of those nests are right by our front door, and one of them seems to be occupied again. Do robins re-use their own nests or possibly another robin re-use a previously established nest?
Why yes they do.
Yes, they will, according to www.science.edu. They will also build new nests on top of old ones, including old nests of other bird species.
http://wiki.answers.com/Q/Do_robins_reuse_the_same_nest
Luke 12:6
Are not five sparrows sold for two pennies? And not one of them is forgotten before God.