Starlings have been nesting for the past several years in a hole in the corner of my neighbor's eaves. It appears that several adult birds take care of it, more than a pair. I have not confirmed this. There's intense activity in the nest right now—chatter, comings and goings, bird droppings piling up on the ledge beneath.
The other day I was standing in the doorway to the back porch and three of the cats came rushing past me; one had a big speckled starling in his mouth. The bird looked stiff and dead. The cat pushed on the inside door, wanting to bring the bird into the house. I said, "No!" He dropped the bird and it burst into life, flying out the porch door and up into the maple before any of us could blink. It seemed unharmed, but if a bird's skin is punctured by cat teeth, it will die of infection. Days after the porch incident, all seems well with the nest. Don't know about the bird.
A few years back I got into trying to rescue birds and bring them to a bird rehabilitator who lived a ways away. Each time I brought her a bird she would excoriate me for letting the cats be outside cats. Once I brought her a large fledgling I hadn't been able to identify. She looked at it and said, "Oh, it's just a starling."