Very sad. The feather loss on the head might imply sibling rivalry in the nest. Nature really is rather red in tooth and claw. Birds just like us need water

Very sad. The feather loss on the head might imply sibling rivalry in the nest. Nature really is rather red in tooth and claw. Birds just like us need water and food. Moving water is best but regularly changed static water is fine but make sure it is changed. Likewise food put out needs to be monitored.