A couple of robins (Turdus migratorius) had a nest with 3 eggs above our mailbox. Later, they had one chick in their nest. The chick was last seen alive early last week when it was still too young to fly. Last Thursday and Friday I checked and photographed the nest. On both occasions neither the parents were around nor was there a chick in the nest.
So it looks like natural selection won this round. Maybe they'll have better luck next time.