Natures puzzle

Why some birds are not the song bird's friend

What is wrong with this picture?

The black bird is a baby cow bird the momma a sparrow

Before you think how sweet. The momma cowbird laid her egg in the sparrows nest and as the baby grew it shoved the sparrow babies out of the nest.

 I happened to catch this scene one morning and couldn't really tell what I was looking at until I did some editing and saw what was going on.  The cow bird and feral cats are decimating the song bird population.