I noticed this homemade bird house hanging on one of the trees in the plaza near our apartment when I was going to meet up with one of my language exchange partners on Friday.  Looks like it's made out of a juice carton - in case you were curious as to what juice cartons look like in Spain.  I didn't see it when I walked through there today, but to be fair - I was pretty focused on going to the park with Jenee and Sam :).