Ethics in Nature

The assignment was to find an example of ethics or ethical behavior in nature.  For example, not getting too close to animals as they go about their daily life.  But I started thinking about this as I snapped the photo of the backyard birdfeeder.  After being up for only one day, birds started coming....all sorts of birds.  I put the feeder up so my granddaughter could get a close up view of birds and learn to appreciate them.
But what about the birds.  The placement of a feeder has changed their behavior patterns as they forage for food in nature.  Is this ethical?  Is this good for the birds?  Professionals have said that feeding birds, while a popular outdoor activity, does not help the birds except under extreme weather conditions like snow and ice cover.  However, it certainly adds to the enjoyment of humans as the birds are more readily visible to us when feeding at these stations.  And if adding to human enjoyment leads to awareness and appreciation of these animals, isn't that a good thing?
My granddaughter, at age 2, can identify cardinals, mourning doves, chickadees, and titmice that visit the feeder.  I think that is good for the birds and my granddaughter!