You'll  remember this photo of my bird feeder adaptation.  
What I didn't know, when installing it, was that I was helping the Cardinal parents.  
They are using this as a teaching tool for take offs and 
landings with 3 or 4 young ones that are just learning to fly.
Momma Cardinal lands on it, to show them it is safe.
on to the tree or the fence.
Then one made a perfect landing on the feeder, and 2 others kept
trying to decide if it was safe.
They ended up on the ground the first round or two.
Just now, mom and 2 of the young landed on the  feeder, but before camera could come out, 
a truck passed and off they flew.
 
